| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | 1 | 
                                    
                                    1.2%
                                 | |
| 5 | 1 | 
                                    
                                    1.2%
                                 | |
| 10 | 2 | 
                                    
                                    2.4%
                                 | |
| 12 | 1 | 
                                    
                                    1.2%
                                 | |
| 20 | 4 | 
                                    
                                    4.9%
                                 | |
| 25 | 2 | 
                                    
                                    2.4%
                                 | |
| 30 | 2 | 
                                    
                                    2.4%
                                 | |
| 40 | 5 | 
                                    
                                    6.1%
                                 | |
| 50 | 8 | 
                                    
                                    9.8%
                                 | |
| 60 | 2 | 
                                    
                                    2.4%
                                 | |
| 70 | 5 | 
                                    
                                    6.1%
                                 | |
| 75 | 8 | 
                                    
                                    9.8%
                                 | |
| 80 | 12 | 
                                    
                                    14.6%
                                 | |
| 85 | 5 | 
                                    
                                    6.1%
                                 | |
| 89 | 1 | 
                                    
                                    1.2%
                                 | |
| 90 | 7 | 
                                    
                                    8.5%
                                 | |
| 95 | 1 | 
                                    
                                    1.2%
                                 | |
| 100 | 15 | 
                                    
                                    18.3%
                                 | |
| Sysmiss | 263 |