| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 | 
                                    
                                    1.4%
                                 | 
| 0 | 5 | 
                                    
                                    1.4%
                                 | |
| 10 | 2 | 
                                    
                                    0.5%
                                 | |
| 13 | 1 | 
                                    
                                    0.3%
                                 | |
| 20 | 7 | 
                                    
                                    1.9%
                                 | |
| 30 | 1 | 
                                    
                                    0.3%
                                 | |
| 40 | 4 | 
                                    
                                    1.1%
                                 | |
| 50 | 23 | 
                                    
                                    6.3%
                                 | |
| 60 | 11 | 
                                    
                                    3%
                                 | |
| 70 | 19 | 
                                    
                                    5.2%
                                 | |
| 72 | 1 | 
                                    
                                    0.3%
                                 | |
| 75 | 1 | 
                                    
                                    0.3%
                                 | |
| 80 | 10 | 
                                    
                                    2.7%
                                 | |
| 85 | 1 | 
                                    
                                    0.3%
                                 | |
| 86 | 1 | 
                                    
                                    0.3%
                                 | |
| 87 | 1 | 
                                    
                                    0.3%
                                 | |
| 90 | 8 | 
                                    
                                    2.2%
                                 | |
| 99 | 2 | 
                                    
                                    0.5%
                                 | |
| 100 | 261 | 
                                    
                                    71.7%
                                 |