| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 623 | 
                                    
                                    44%
                                 | 
| 0 | 98 | 
                                    
                                    6.9%
                                 | |
| 1 | 4 | 
                                    
                                    0.3%
                                 | |
| 2 | 2 | 
                                    
                                    0.1%
                                 | |
| 3 | 5 | 
                                    
                                    0.4%
                                 | |
| 4 | 2 | 
                                    
                                    0.1%
                                 | |
| 5 | 13 | 
                                    
                                    0.9%
                                 | |
| 6 | 1 | 
                                    
                                    0.1%
                                 | |
| 10 | 18 | 
                                    
                                    1.3%
                                 | |
| 13 | 1 | 
                                    
                                    0.1%
                                 | |
| 15 | 10 | 
                                    
                                    0.7%
                                 | |
| 18 | 1 | 
                                    
                                    0.1%
                                 | |
| 20 | 51 | 
                                    
                                    3.6%
                                 | |
| 25 | 13 | 
                                    
                                    0.9%
                                 | |
| 27 | 1 | 
                                    
                                    0.1%
                                 | |
| 28 | 1 | 
                                    
                                    0.1%
                                 | |
| 30 | 46 | 
                                    
                                    3.2%
                                 | |
| 35 | 7 | 
                                    
                                    0.5%
                                 | |
| 40 | 53 | 
                                    
                                    3.7%
                                 | |
| 45 | 8 | 
                                    
                                    0.6%
                                 | |
| 48 | 1 | 
                                    
                                    0.1%
                                 | |
| 50 | 65 | 
                                    
                                    4.6%
                                 | |
| 52 | 1 | 
                                    
                                    0.1%
                                 | |
| 55 | 5 | 
                                    
                                    0.4%
                                 | |
| 60 | 54 | 
                                    
                                    3.8%
                                 | |
| 65 | 5 | 
                                    
                                    0.4%
                                 | |
| 68 | 1 | 
                                    
                                    0.1%
                                 | |
| 70 | 56 | 
                                    
                                    4%
                                 | |
| 75 | 16 | 
                                    
                                    1.1%
                                 | |
| 76 | 1 | 
                                    
                                    0.1%
                                 | |
| 80 | 78 | 
                                    
                                    5.5%
                                 | |
| 85 | 10 | 
                                    
                                    0.7%
                                 | |
| 86 | 1 | 
                                    
                                    0.1%
                                 | |
| 87 | 1 | 
                                    
                                    0.1%
                                 | |
| 90 | 72 | 
                                    
                                    5.1%
                                 | |
| 95 | 17 | 
                                    
                                    1.2%
                                 | |
| 99 | 2 | 
                                    
                                    0.1%
                                 | |
| 100 | 72 | 
                                    
                                    5.1%
                                 |