| Value | Category | Cases | |
|---|---|---|---|
| -9 | don't know | 32 | 
                                    
                                    23.7%
                                 | 
| 0 | 2 | 
                                    
                                    1.5%
                                 | |
| 1 | 4 | 
                                    
                                    3%
                                 | |
| 2 | 7 | 
                                    
                                    5.2%
                                 | |
| 3 | 7 | 
                                    
                                    5.2%
                                 | |
| 4 | 3 | 
                                    
                                    2.2%
                                 | |
| 5 | 8 | 
                                    
                                    5.9%
                                 | |
| 7 | 3 | 
                                    
                                    2.2%
                                 | |
| 8 | 1 | 
                                    
                                    0.7%
                                 | |
| 10 | 9 | 
                                    
                                    6.7%
                                 | |
| 14 | 2 | 
                                    
                                    1.5%
                                 | |
| 15 | 2 | 
                                    
                                    1.5%
                                 | |
| 20 | 9 | 
                                    
                                    6.7%
                                 | |
| 21 | 1 | 
                                    
                                    0.7%
                                 | |
| 30 | 15 | 
                                    
                                    11.1%
                                 | |
| 40 | 1 | 
                                    
                                    0.7%
                                 | |
| 50 | 1 | 
                                    
                                    0.7%
                                 | |
| 60 | 7 | 
                                    
                                    5.2%
                                 | |
| 80 | 2 | 
                                    
                                    1.5%
                                 | |
| 90 | 4 | 
                                    
                                    3%
                                 | |
| 100 | 2 | 
                                    
                                    1.5%
                                 | |
| 120 | 1 | 
                                    
                                    0.7%
                                 | |
| 180 | 5 | 
                                    
                                    3.7%
                                 | |
| 200 | 1 | 
                                    
                                    0.7%
                                 | |
| 350 | 1 | 
                                    
                                    0.7%
                                 | |
| 365 | 1 | 
                                    
                                    0.7%
                                 | |
| 400 | 1 | 
                                    
                                    0.7%
                                 | |
| 480 | 1 | 
                                    
                                    0.7%
                                 | |
| 600 | 2 | 
                                    
                                    1.5%
                                 | |
| Sysmiss | 820 |