| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 | 
                                    
                                    5.6%
                                 | 
| 0 | 7 | 
                                    
                                    3.3%
                                 | |
| 1 | 17 | 
                                    
                                    7.9%
                                 | |
| 2 | 39 | 
                                    
                                    18.1%
                                 | |
| 3 | 24 | 
                                    
                                    11.2%
                                 | |
| 4 | 23 | 
                                    
                                    10.7%
                                 | |
| 5 | 20 | 
                                    
                                    9.3%
                                 | |
| 6 | 11 | 
                                    
                                    5.1%
                                 | |
| 7 | 4 | 
                                    
                                    1.9%
                                 | |
| 8 | 8 | 
                                    
                                    3.7%
                                 | |
| 10 | 12 | 
                                    
                                    5.6%
                                 | |
| 11 | 4 | 
                                    
                                    1.9%
                                 | |
| 12 | 3 | 
                                    
                                    1.4%
                                 | |
| 13 | 2 | 
                                    
                                    0.9%
                                 | |
| 15 | 7 | 
                                    
                                    3.3%
                                 | |
| 16 | 1 | 
                                    
                                    0.5%
                                 | |
| 18 | 1 | 
                                    
                                    0.5%
                                 | |
| 20 | 5 | 
                                    
                                    2.3%
                                 | |
| 23 | 1 | 
                                    
                                    0.5%
                                 | |
| 25 | 1 | 
                                    
                                    0.5%
                                 | |
| 27 | 1 | 
                                    
                                    0.5%
                                 | |
| 40 | 2 | 
                                    
                                    0.9%
                                 | |
| 47 | 1 | 
                                    
                                    0.5%
                                 | |
| 54 | 1 | 
                                    
                                    0.5%
                                 | |
| 80 | 1 | 
                                    
                                    0.5%
                                 | |
| 81 | 1 | 
                                    
                                    0.5%
                                 | |
| 93 | 1 | 
                                    
                                    0.5%
                                 | |
| 132 | 1 | 
                                    
                                    0.5%
                                 | |
| 160 | 1 | 
                                    
                                    0.5%
                                 | |
| 200 | 1 | 
                                    
                                    0.5%
                                 | |
| 210 | 1 | 
                                    
                                    0.5%
                                 | |
| 800 | 1 | 
                                    
                                    0.5%
                                 |