| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 15 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    
| 1 | One year or less | 2 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| 2 | 4 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 3 | 7 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 4 | 11 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 5 | 18 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 6 | 13 | 
                                                                 
                                    
                                    1.7%
                                 
                                                             | 
                                                        
                    |
| 7 | 17 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    |
| 8 | 16 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 9 | 15 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 10 | 77 | 
                                                                 
                                    
                                    10%
                                 
                                                             | 
                                                        
                    |
| 11 | 26 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 12 | 19 | 
                                                                 
                                    
                                    2.5%
                                 
                                                             | 
                                                        
                    |
| 13 | 16 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 14 | 10 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    |
| 15 | 82 | 
                                                                 
                                    
                                    10.6%
                                 
                                                             | 
                                                        
                    |
| 16 | 11 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 17 | 14 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 18 | 18 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 19 | 10 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    |
| 20 | 115 | 
                                                                 
                                    
                                    14.9%
                                 
                                                             | 
                                                        
                    |
| 21 | 4 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 22 | 18 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 23 | 17 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    |
| 24 | 6 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 25 | 70 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    |
| 26 | 12 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| 27 | 18 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 28 | 6 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 29 | 4 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 30 | 66 | 
                                                                 
                                    
                                    8.5%
                                 
                                                             | 
                                                        
                    |
| 33 | 2 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 34 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 35 | 12 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| 36 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 37 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 38 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 39 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 40 | 8 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 42 | 2 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 45 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 47 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 50 | 2 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 52 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 54 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             |