| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 | 
                                    
                                    6%
                                 | 
| 0 | 68 | 
                                    
                                    31.6%
                                 | |
| 1 | 31 | 
                                    
                                    14.4%
                                 | |
| 2 | 22 | 
                                    
                                    10.2%
                                 | |
| 3 | 13 | 
                                    
                                    6%
                                 | |
| 4 | 11 | 
                                    
                                    5.1%
                                 | |
| 5 | 7 | 
                                    
                                    3.3%
                                 | |
| 6 | 3 | 
                                    
                                    1.4%
                                 | |
| 7 | 3 | 
                                    
                                    1.4%
                                 | |
| 8 | 2 | 
                                    
                                    0.9%
                                 | |
| 9 | 3 | 
                                    
                                    1.4%
                                 | |
| 10 | 4 | 
                                    
                                    1.9%
                                 | |
| 11 | 1 | 
                                    
                                    0.5%
                                 | |
| 12 | 2 | 
                                    
                                    0.9%
                                 | |
| 13 | 1 | 
                                    
                                    0.5%
                                 | |
| 14 | 3 | 
                                    
                                    1.4%
                                 | |
| 15 | 2 | 
                                    
                                    0.9%
                                 | |
| 17 | 2 | 
                                    
                                    0.9%
                                 | |
| 19 | 1 | 
                                    
                                    0.5%
                                 | |
| 20 | 5 | 
                                    
                                    2.3%
                                 | |
| 25 | 2 | 
                                    
                                    0.9%
                                 | |
| 26 | 1 | 
                                    
                                    0.5%
                                 | |
| 28 | 2 | 
                                    
                                    0.9%
                                 | |
| 31 | 1 | 
                                    
                                    0.5%
                                 | |
| 32 | 1 | 
                                    
                                    0.5%
                                 | |
| 33 | 1 | 
                                    
                                    0.5%
                                 | |
| 40 | 1 | 
                                    
                                    0.5%
                                 | |
| 45 | 2 | 
                                    
                                    0.9%
                                 | |
| 48 | 1 | 
                                    
                                    0.5%
                                 | |
| 58 | 1 | 
                                    
                                    0.5%
                                 | |
| 62 | 2 | 
                                    
                                    0.9%
                                 | |
| 150 | 1 | 
                                    
                                    0.5%
                                 | |
| 250 | 1 | 
                                    
                                    0.5%
                                 | |
| 900 | 1 | 
                                    
                                    0.5%
                                 |