| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 39 | 
                                    
                                    2.8%
                                 | 
| 0 | 97 | 
                                    
                                    6.9%
                                 | |
| 5 | 1 | 
                                    
                                    0.1%
                                 | |
| 10 | 5 | 
                                    
                                    0.4%
                                 | |
| 15 | 2 | 
                                    
                                    0.1%
                                 | |
| 20 | 15 | 
                                    
                                    1.1%
                                 | |
| 25 | 4 | 
                                    
                                    0.3%
                                 | |
| 30 | 16 | 
                                    
                                    1.1%
                                 | |
| 35 | 3 | 
                                    
                                    0.2%
                                 | |
| 40 | 14 | 
                                    
                                    1%
                                 | |
| 42 | 1 | 
                                    
                                    0.1%
                                 | |
| 50 | 52 | 
                                    
                                    3.7%
                                 | |
| 60 | 35 | 
                                    
                                    2.5%
                                 | |
| 65 | 8 | 
                                    
                                    0.6%
                                 | |
| 70 | 44 | 
                                    
                                    3.1%
                                 | |
| 75 | 10 | 
                                    
                                    0.7%
                                 | |
| 80 | 57 | 
                                    
                                    4%
                                 | |
| 85 | 7 | 
                                    
                                    0.5%
                                 | |
| 90 | 31 | 
                                    
                                    2.2%
                                 | |
| 95 | 8 | 
                                    
                                    0.6%
                                 | |
| 97 | 3 | 
                                    
                                    0.2%
                                 | |
| 98 | 1 | 
                                    
                                    0.1%
                                 | |
| 99 | 2 | 
                                    
                                    0.1%
                                 | |
| 100 | 961 | 
                                    
                                    67.9%
                                 |