| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 46 | 
                                    
                                    21.4%
                                 | 
| -4 | Too many to count | 92 | 
                                    
                                    42.8%
                                 | 
| 0 | 8 | 
                                    
                                    3.7%
                                 | |
| 1 | 5 | 
                                    
                                    2.3%
                                 | |
| 2 | 9 | 
                                    
                                    4.2%
                                 | |
| 3 | 11 | 
                                    
                                    5.1%
                                 | |
| 4 | 10 | 
                                    
                                    4.7%
                                 | |
| 5 | 4 | 
                                    
                                    1.9%
                                 | |
| 6 | 4 | 
                                    
                                    1.9%
                                 | |
| 7 | 2 | 
                                    
                                    0.9%
                                 | |
| 8 | 4 | 
                                    
                                    1.9%
                                 | |
| 9 | 1 | 
                                    
                                    0.5%
                                 | |
| 10 | 7 | 
                                    
                                    3.3%
                                 | |
| 12 | 3 | 
                                    
                                    1.4%
                                 | |
| 15 | 1 | 
                                    
                                    0.5%
                                 | |
| 20 | 2 | 
                                    
                                    0.9%
                                 | |
| 24 | 1 | 
                                    
                                    0.5%
                                 | |
| 25 | 1 | 
                                    
                                    0.5%
                                 | |
| 60 | 1 | 
                                    
                                    0.5%
                                 | |
| 100 | 1 | 
                                    
                                    0.5%
                                 | |
| 300 | 1 | 
                                    
                                    0.5%
                                 | |
| 500 | 1 | 
                                    
                                    0.5%
                                 |