| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 35 | 
                                    
                                    38%
                                 | 
| 0 | 2 | 
                                    
                                    2.2%
                                 | |
| 100 | 1 | 
                                    
                                    1.1%
                                 | |
| 350 | 2 | 
                                    
                                    2.2%
                                 | |
| 400 | 1 | 
                                    
                                    1.1%
                                 | |
| 450 | 2 | 
                                    
                                    2.2%
                                 | |
| 500 | 4 | 
                                    
                                    4.3%
                                 | |
| 800 | 1 | 
                                    
                                    1.1%
                                 | |
| 1000 | 14 | 
                                    
                                    15.2%
                                 | |
| 1200 | 3 | 
                                    
                                    3.3%
                                 | |
| 1500 | 1 | 
                                    
                                    1.1%
                                 | |
| 2000 | 3 | 
                                    
                                    3.3%
                                 | |
| 3000 | 5 | 
                                    
                                    5.4%
                                 | |
| 3800 | 1 | 
                                    
                                    1.1%
                                 | |
| 5000 | 2 | 
                                    
                                    2.2%
                                 | |
| 10000 | 6 | 
                                    
                                    6.5%
                                 | |
| 15000 | 2 | 
                                    
                                    2.2%
                                 | |
| 20000 | 3 | 
                                    
                                    3.3%
                                 | |
| 30000 | 1 | 
                                    
                                    1.1%
                                 | |
| 38000 | 1 | 
                                    
                                    1.1%
                                 | |
| 39000 | 1 | 
                                    
                                    1.1%
                                 | |
| 100000 | 1 | 
                                    
                                    1.1%
                                 | |
| Sysmiss | 553 |