| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | None | 0 | 
                                    
                                    0%
                                 | 
| 10 | 1 | 
                                    
                                    2.8%
                                 | |
| 20 | 1 | 
                                    
                                    2.8%
                                 | |
| 30 | 2 | 
                                    
                                    5.6%
                                 | |
| 40 | 1 | 
                                    
                                    2.8%
                                 | |
| 50 | 1 | 
                                    
                                    2.8%
                                 | |
| 100 | 1 | 
                                    
                                    2.8%
                                 | |
| 200 | 4 | 
                                    
                                    11.1%
                                 | |
| 300 | 2 | 
                                    
                                    5.6%
                                 | |
| 400 | 2 | 
                                    
                                    5.6%
                                 | |
| 450 | 1 | 
                                    
                                    2.8%
                                 | |
| 500 | 1 | 
                                    
                                    2.8%
                                 | |
| 540 | 1 | 
                                    
                                    2.8%
                                 | |
| 600 | 2 | 
                                    
                                    5.6%
                                 | |
| 800 | 2 | 
                                    
                                    5.6%
                                 | |
| 900 | 2 | 
                                    
                                    5.6%
                                 | |
| 1000 | 1 | 
                                    
                                    2.8%
                                 | |
| 1200 | 2 | 
                                    
                                    5.6%
                                 | |
| 2000 | 3 | 
                                    
                                    8.3%
                                 | |
| 5000 | 2 | 
                                    
                                    5.6%
                                 | |
| 7200 | 1 | 
                                    
                                    2.8%
                                 | |
| 12000 | 1 | 
                                    
                                    2.8%
                                 | |
| 50000 | 1 | 
                                    
                                    2.8%
                                 | |
| 100000 | 1 | 
                                    
                                    2.8%
                                 | |
| Sysmiss | 576 |