| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 15 | 
                                    
                                    4.8%
                                 | 
| 0 | 7 | 
                                    
                                    2.3%
                                 | |
| 5 | 4 | 
                                    
                                    1.3%
                                 | |
| 10 | 6 | 
                                    
                                    1.9%
                                 | |
| 15 | 2 | 
                                    
                                    0.6%
                                 | |
| 20 | 11 | 
                                    
                                    3.5%
                                 | |
| 25 | 3 | 
                                    
                                    1%
                                 | |
| 30 | 21 | 
                                    
                                    6.8%
                                 | |
| 35 | 1 | 
                                    
                                    0.3%
                                 | |
| 40 | 6 | 
                                    
                                    1.9%
                                 | |
| 50 | 31 | 
                                    
                                    10%
                                 | |
| 54 | 1 | 
                                    
                                    0.3%
                                 | |
| 55 | 1 | 
                                    
                                    0.3%
                                 | |
| 60 | 7 | 
                                    
                                    2.3%
                                 | |
| 65 | 2 | 
                                    
                                    0.6%
                                 | |
| 70 | 24 | 
                                    
                                    7.7%
                                 | |
| 75 | 2 | 
                                    
                                    0.6%
                                 | |
| 80 | 19 | 
                                    
                                    6.1%
                                 | |
| 83 | 1 | 
                                    
                                    0.3%
                                 | |
| 85 | 1 | 
                                    
                                    0.3%
                                 | |
| 88 | 1 | 
                                    
                                    0.3%
                                 | |
| 90 | 15 | 
                                    
                                    4.8%
                                 | |
| 95 | 3 | 
                                    
                                    1%
                                 | |
| 98 | 1 | 
                                    
                                    0.3%
                                 | |
| 99 | 1 | 
                                    
                                    0.3%
                                 | |
| 100 | 125 | 
                                    
                                    40.2%
                                 |