| Value | Category | Cases | |
|---|---|---|---|
| 1 | 3 | 
                                    
                                    0.1%
                                 | |
| 2 | 3 | 
                                    
                                    0.1%
                                 | |
| 6 | 1 | 
                                    
                                    0%
                                 | |
| 7 | 9 | 
                                    
                                    0.3%
                                 | |
| 8 | 46 | 
                                    
                                    1.8%
                                 | |
| 9 | 190 | 
                                    
                                    7.3%
                                 | |
| 10 | 340 | 
                                    
                                    13.1%
                                 | |
| 11 | 326 | 
                                    
                                    12.6%
                                 | |
| 12 | 345 | 
                                    
                                    13.3%
                                 | |
| 13 | 325 | 
                                    
                                    12.5%
                                 | |
| 14 | 326 | 
                                    
                                    12.6%
                                 | |
| 15 | 249 | 
                                    
                                    9.6%
                                 | |
| 16 | 237 | 
                                    
                                    9.1%
                                 | |
| 17 | 138 | 
                                    
                                    5.3%
                                 | |
| 18 | 25 | 
                                    
                                    1%
                                 | |
| 19 | 4 | 
                                    
                                    0.2%
                                 | |
| 20 | 2 | 
                                    
                                    0.1%
                                 | |
| 21 | 1 | 
                                    
                                    0%
                                 | |
| 88 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| 99 | Missing | 26 | 
                                    
                                    1%
                                 | 
| Sysmiss | 169 |