| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    0.3%
                                 | 
| 0 | 8 | 
                                    
                                    2.2%
                                 | |
| 1 | 1 | 
                                    
                                    0.3%
                                 | |
| 15 | 1 | 
                                    
                                    0.3%
                                 | |
| 20 | 9 | 
                                    
                                    2.5%
                                 | |
| 30 | 19 | 
                                    
                                    5.2%
                                 | |
| 35 | 1 | 
                                    
                                    0.3%
                                 | |
| 40 | 15 | 
                                    
                                    4.1%
                                 | |
| 50 | 37 | 
                                    
                                    10.2%
                                 | |
| 60 | 12 | 
                                    
                                    3.3%
                                 | |
| 65 | 1 | 
                                    
                                    0.3%
                                 | |
| 70 | 32 | 
                                    
                                    8.8%
                                 | |
| 75 | 2 | 
                                    
                                    0.6%
                                 | |
| 80 | 13 | 
                                    
                                    3.6%
                                 | |
| 90 | 6 | 
                                    
                                    1.7%
                                 | |
| 100 | 205 | 
                                    
                                    56.5%
                                 |