| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 138 | 
                                    
                                    21.4%
                                 | 
| 0 | 134 | 
                                    
                                    20.8%
                                 | |
| 1 | 14 | 
                                    
                                    2.2%
                                 | |
| 2 | 49 | 
                                    
                                    7.6%
                                 | |
| 3 | 9 | 
                                    
                                    1.4%
                                 | |
| 4 | 1 | 
                                    
                                    0.2%
                                 | |
| 5 | 18 | 
                                    
                                    2.8%
                                 | |
| 6 | 1 | 
                                    
                                    0.2%
                                 | |
| 7 | 1 | 
                                    
                                    0.2%
                                 | |
| 8 | 4 | 
                                    
                                    0.6%
                                 | |
| 10 | 51 | 
                                    
                                    7.9%
                                 | |
| 15 | 15 | 
                                    
                                    2.3%
                                 | |
| 16 | 1 | 
                                    
                                    0.2%
                                 | |
| 18 | 1 | 
                                    
                                    0.2%
                                 | |
| 20 | 32 | 
                                    
                                    5%
                                 | |
| 25 | 7 | 
                                    
                                    1.1%
                                 | |
| 28 | 2 | 
                                    
                                    0.3%
                                 | |
| 30 | 39 | 
                                    
                                    6%
                                 | |
| 32 | 1 | 
                                    
                                    0.2%
                                 | |
| 35 | 4 | 
                                    
                                    0.6%
                                 | |
| 40 | 20 | 
                                    
                                    3.1%
                                 | |
| 45 | 3 | 
                                    
                                    0.5%
                                 | |
| 50 | 30 | 
                                    
                                    4.7%
                                 | |
| 55 | 1 | 
                                    
                                    0.2%
                                 | |
| 60 | 19 | 
                                    
                                    2.9%
                                 | |
| 65 | 4 | 
                                    
                                    0.6%
                                 | |
| 70 | 9 | 
                                    
                                    1.4%
                                 | |
| 75 | 2 | 
                                    
                                    0.3%
                                 | |
| 80 | 10 | 
                                    
                                    1.6%
                                 | |
| 90 | 11 | 
                                    
                                    1.7%
                                 | |
| 94 | 1 | 
                                    
                                    0.2%
                                 | |
| 95 | 3 | 
                                    
                                    0.5%
                                 | |
| 100 | 10 | 
                                    
                                    1.6%
                                 |