| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 | 
                                    
                                    23.1%
                                 | 
| 100 | 1 | 
                                    
                                    2.6%
                                 | |
| 120 | 1 | 
                                    
                                    2.6%
                                 | |
| 130 | 1 | 
                                    
                                    2.6%
                                 | |
| 201 | 1 | 
                                    
                                    2.6%
                                 | |
| 250 | 1 | 
                                    
                                    2.6%
                                 | |
| 300 | 1 | 
                                    
                                    2.6%
                                 | |
| 450 | 1 | 
                                    
                                    2.6%
                                 | |
| 500 | 2 | 
                                    
                                    5.1%
                                 | |
| 1000 | 4 | 
                                    
                                    10.3%
                                 | |
| 1200 | 1 | 
                                    
                                    2.6%
                                 | |
| 1500 | 5 | 
                                    
                                    12.8%
                                 | |
| 2000 | 5 | 
                                    
                                    12.8%
                                 | |
| 3000 | 2 | 
                                    
                                    5.1%
                                 | |
| 3100 | 1 | 
                                    
                                    2.6%
                                 | |
| 4000 | 2 | 
                                    
                                    5.1%
                                 | |
| 5000 | 1 | 
                                    
                                    2.6%
                                 | |
| Sysmiss | 325 |