| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 | 
                                    
                                    8.1%
                                 | 
| -4 | Too many to count | 50 | 
                                    
                                    45%
                                 | 
| 0 | 1 | 
                                    
                                    0.9%
                                 | |
| 1 | 2 | 
                                    
                                    1.8%
                                 | |
| 2 | 8 | 
                                    
                                    7.2%
                                 | |
| 3 | 12 | 
                                    
                                    10.8%
                                 | |
| 4 | 7 | 
                                    
                                    6.3%
                                 | |
| 5 | 5 | 
                                    
                                    4.5%
                                 | |
| 6 | 1 | 
                                    
                                    0.9%
                                 | |
| 7 | 2 | 
                                    
                                    1.8%
                                 | |
| 8 | 3 | 
                                    
                                    2.7%
                                 | |
| 10 | 4 | 
                                    
                                    3.6%
                                 | |
| 12 | 3 | 
                                    
                                    2.7%
                                 | |
| 15 | 1 | 
                                    
                                    0.9%
                                 | |
| 20 | 1 | 
                                    
                                    0.9%
                                 | |
| 50 | 1 | 
                                    
                                    0.9%
                                 | |
| 60 | 1 | 
                                    
                                    0.9%
                                 |