| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 | 
                                    
                                    5.1%
                                 | 
| 0 | 10 | 
                                    
                                    4.7%
                                 | |
| 10 | 4 | 
                                    
                                    1.9%
                                 | |
| 15 | 1 | 
                                    
                                    0.5%
                                 | |
| 17 | 1 | 
                                    
                                    0.5%
                                 | |
| 20 | 6 | 
                                    
                                    2.8%
                                 | |
| 25 | 4 | 
                                    
                                    1.9%
                                 | |
| 30 | 10 | 
                                    
                                    4.7%
                                 | |
| 40 | 9 | 
                                    
                                    4.2%
                                 | |
| 45 | 1 | 
                                    
                                    0.5%
                                 | |
| 50 | 17 | 
                                    
                                    7.9%
                                 | |
| 55 | 1 | 
                                    
                                    0.5%
                                 | |
| 60 | 14 | 
                                    
                                    6.5%
                                 | |
| 64 | 1 | 
                                    
                                    0.5%
                                 | |
| 65 | 1 | 
                                    
                                    0.5%
                                 | |
| 70 | 18 | 
                                    
                                    8.4%
                                 | |
| 75 | 3 | 
                                    
                                    1.4%
                                 | |
| 78 | 1 | 
                                    
                                    0.5%
                                 | |
| 80 | 14 | 
                                    
                                    6.5%
                                 | |
| 85 | 1 | 
                                    
                                    0.5%
                                 | |
| 90 | 8 | 
                                    
                                    3.7%
                                 | |
| 93 | 2 | 
                                    
                                    0.9%
                                 | |
| 95 | 1 | 
                                    
                                    0.5%
                                 | |
| 98 | 1 | 
                                    
                                    0.5%
                                 | |
| 100 | 75 | 
                                    
                                    34.9%
                                 |