| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 | 
                                    
                                    0.8%
                                 | 
| 0 | 306 | 
                                    
                                    24.7%
                                 | |
| 10 | 1 | 
                                    
                                    0.1%
                                 | |
| 12 | 1 | 
                                    
                                    0.1%
                                 | |
| 20 | 2 | 
                                    
                                    0.2%
                                 | |
| 25 | 1 | 
                                    
                                    0.1%
                                 | |
| 30 | 1 | 
                                    
                                    0.1%
                                 | |
| 50 | 18 | 
                                    
                                    1.5%
                                 | |
| 60 | 2 | 
                                    
                                    0.2%
                                 | |
| 70 | 5 | 
                                    
                                    0.4%
                                 | |
| 80 | 9 | 
                                    
                                    0.7%
                                 | |
| 85 | 2 | 
                                    
                                    0.2%
                                 | |
| 90 | 4 | 
                                    
                                    0.3%
                                 | |
| 95 | 1 | 
                                    
                                    0.1%
                                 | |
| 99 | 2 | 
                                    
                                    0.2%
                                 | |
| 100 | 874 | 
                                    
                                    70.5%
                                 |