| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1 | 
                                    
                                    0%
                                 | |
| 2 | 1 | 
                                    
                                    0%
                                 | |
| 6 | 6 | 
                                    
                                    0.2%
                                 | |
| 7 | 29 | 
                                    
                                    1.1%
                                 | |
| 8 | 191 | 
                                    
                                    7.4%
                                 | |
| 9 | 302 | 
                                    
                                    11.6%
                                 | |
| 10 | 340 | 
                                    
                                    13.1%
                                 | |
| 11 | 343 | 
                                    
                                    13.2%
                                 | |
| 12 | 313 | 
                                    
                                    12.1%
                                 | |
| 13 | 336 | 
                                    
                                    12.9%
                                 | |
| 14 | 275 | 
                                    
                                    10.6%
                                 | |
| 15 | 222 | 
                                    
                                    8.6%
                                 | |
| 16 | 159 | 
                                    
                                    6.1%
                                 | |
| 17 | 43 | 
                                    
                                    1.7%
                                 | |
| 18 | 8 | 
                                    
                                    0.3%
                                 | |
| 19 | 2 | 
                                    
                                    0.1%
                                 | |
| 20 | 1 | 
                                    
                                    0%
                                 | |
| 88 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| 99 | Missing | 24 | 
                                    
                                    0.9%
                                 | 
| Sysmiss | 169 |