| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | 8 | 
                                    
                                    4.2%
                                 | |
| 5 | 2 | 
                                    
                                    1%
                                 | |
| 10 | 15 | 
                                    
                                    7.9%
                                 | |
| 15 | 2 | 
                                    
                                    1%
                                 | |
| 20 | 13 | 
                                    
                                    6.8%
                                 | |
| 25 | 10 | 
                                    
                                    5.2%
                                 | |
| 30 | 24 | 
                                    
                                    12.6%
                                 | |
| 33 | 3 | 
                                    
                                    1.6%
                                 | |
| 35 | 7 | 
                                    
                                    3.7%
                                 | |
| 40 | 15 | 
                                    
                                    7.9%
                                 | |
| 45 | 4 | 
                                    
                                    2.1%
                                 | |
| 50 | 52 | 
                                    
                                    27.2%
                                 | |
| 60 | 7 | 
                                    
                                    3.7%
                                 | |
| 70 | 8 | 
                                    
                                    4.2%
                                 | |
| 75 | 2 | 
                                    
                                    1%
                                 | |
| 80 | 12 | 
                                    
                                    6.3%
                                 | |
| 85 | 2 | 
                                    
                                    1%
                                 | |
| 90 | 3 | 
                                    
                                    1.6%
                                 | |
| 100 | 2 | 
                                    
                                    1%
                                 | |
| Sysmiss | 154 |