| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 647 | 
                                    
                                    45.7%
                                 | 
| 0 | 104 | 
                                    
                                    7.3%
                                 | |
| 1 | 4 | 
                                    
                                    0.3%
                                 | |
| 2 | 3 | 
                                    
                                    0.2%
                                 | |
| 3 | 1 | 
                                    
                                    0.1%
                                 | |
| 4 | 1 | 
                                    
                                    0.1%
                                 | |
| 5 | 10 | 
                                    
                                    0.7%
                                 | |
| 6 | 1 | 
                                    
                                    0.1%
                                 | |
| 7 | 1 | 
                                    
                                    0.1%
                                 | |
| 8 | 2 | 
                                    
                                    0.1%
                                 | |
| 10 | 31 | 
                                    
                                    2.2%
                                 | |
| 12 | 1 | 
                                    
                                    0.1%
                                 | |
| 13 | 1 | 
                                    
                                    0.1%
                                 | |
| 15 | 12 | 
                                    
                                    0.8%
                                 | |
| 20 | 59 | 
                                    
                                    4.2%
                                 | |
| 25 | 27 | 
                                    
                                    1.9%
                                 | |
| 27 | 1 | 
                                    
                                    0.1%
                                 | |
| 28 | 1 | 
                                    
                                    0.1%
                                 | |
| 30 | 36 | 
                                    
                                    2.5%
                                 | |
| 32 | 1 | 
                                    
                                    0.1%
                                 | |
| 33 | 1 | 
                                    
                                    0.1%
                                 | |
| 35 | 9 | 
                                    
                                    0.6%
                                 | |
| 40 | 58 | 
                                    
                                    4.1%
                                 | |
| 45 | 8 | 
                                    
                                    0.6%
                                 | |
| 50 | 49 | 
                                    
                                    3.5%
                                 | |
| 55 | 5 | 
                                    
                                    0.4%
                                 | |
| 60 | 36 | 
                                    
                                    2.5%
                                 | |
| 64 | 1 | 
                                    
                                    0.1%
                                 | |
| 65 | 2 | 
                                    
                                    0.1%
                                 | |
| 70 | 58 | 
                                    
                                    4.1%
                                 | |
| 75 | 14 | 
                                    
                                    1%
                                 | |
| 80 | 85 | 
                                    
                                    6%
                                 | |
| 85 | 3 | 
                                    
                                    0.2%
                                 | |
| 90 | 40 | 
                                    
                                    2.8%
                                 | |
| 95 | 14 | 
                                    
                                    1%
                                 | |
| 98 | 3 | 
                                    
                                    0.2%
                                 | |
| 99 | 2 | 
                                    
                                    0.1%
                                 | |
| 100 | 84 | 
                                    
                                    5.9%
                                 |