| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 | 
                                    
                                    5.1%
                                 | 
| 0 | 138 | 
                                    
                                    64.2%
                                 | |
| 5 | 1 | 
                                    
                                    0.5%
                                 | |
| 10 | 11 | 
                                    
                                    5.1%
                                 | |
| 15 | 1 | 
                                    
                                    0.5%
                                 | |
| 20 | 12 | 
                                    
                                    5.6%
                                 | |
| 25 | 5 | 
                                    
                                    2.3%
                                 | |
| 30 | 13 | 
                                    
                                    6%
                                 | |
| 35 | 1 | 
                                    
                                    0.5%
                                 | |
| 36 | 1 | 
                                    
                                    0.5%
                                 | |
| 40 | 4 | 
                                    
                                    1.9%
                                 | |
| 50 | 9 | 
                                    
                                    4.2%
                                 | |
| 60 | 2 | 
                                    
                                    0.9%
                                 | |
| 65 | 1 | 
                                    
                                    0.5%
                                 | |
| 70 | 2 | 
                                    
                                    0.9%
                                 | |
| 75 | 1 | 
                                    
                                    0.5%
                                 | |
| 100 | 2 | 
                                    
                                    0.9%
                                 |