| Value | Category | Cases | |
|---|---|---|---|
| -9 | don't know | 20 | 
                                    
                                    37%
                                 | 
| -8 | refusal | 1 | 
                                    
                                    1.9%
                                 | 
| 0 | 4 | 
                                    
                                    7.4%
                                 | |
| 50 | 2 | 
                                    
                                    3.7%
                                 | |
| 150 | 1 | 
                                    
                                    1.9%
                                 | |
| 200 | 2 | 
                                    
                                    3.7%
                                 | |
| 300 | 1 | 
                                    
                                    1.9%
                                 | |
| 500 | 1 | 
                                    
                                    1.9%
                                 | |
| 1000 | 5 | 
                                    
                                    9.3%
                                 | |
| 1500 | 1 | 
                                    
                                    1.9%
                                 | |
| 2000 | 6 | 
                                    
                                    11.1%
                                 | |
| 3000 | 4 | 
                                    
                                    7.4%
                                 | |
| 4000 | 1 | 
                                    
                                    1.9%
                                 | |
| 5000 | 3 | 
                                    
                                    5.6%
                                 | |
| 7000 | 2 | 
                                    
                                    3.7%
                                 | |
| Sysmiss | 901 |