| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 | 
                                    
                                    12.5%
                                 | 
| 0 | 4 | 
                                    
                                    3.8%
                                 | |
| 1 | 1 | 
                                    
                                    1%
                                 | |
| 100 | 2 | 
                                    
                                    1.9%
                                 | |
| 150 | 1 | 
                                    
                                    1%
                                 | |
| 180 | 1 | 
                                    
                                    1%
                                 | |
| 200 | 2 | 
                                    
                                    1.9%
                                 | |
| 250 | 1 | 
                                    
                                    1%
                                 | |
| 300 | 3 | 
                                    
                                    2.9%
                                 | |
| 400 | 1 | 
                                    
                                    1%
                                 | |
| 500 | 3 | 
                                    
                                    2.9%
                                 | |
| 553 | 1 | 
                                    
                                    1%
                                 | |
| 600 | 1 | 
                                    
                                    1%
                                 | |
| 750 | 1 | 
                                    
                                    1%
                                 | |
| 800 | 1 | 
                                    
                                    1%
                                 | |
| 1000 | 11 | 
                                    
                                    10.6%
                                 | |
| 1200 | 2 | 
                                    
                                    1.9%
                                 | |
| 1300 | 1 | 
                                    
                                    1%
                                 | |
| 1500 | 3 | 
                                    
                                    2.9%
                                 | |
| 1615 | 1 | 
                                    
                                    1%
                                 | |
| 1700 | 1 | 
                                    
                                    1%
                                 | |
| 1740 | 1 | 
                                    
                                    1%
                                 | |
| 1800 | 1 | 
                                    
                                    1%
                                 | |
| 2000 | 9 | 
                                    
                                    8.7%
                                 | |
| 2100 | 1 | 
                                    
                                    1%
                                 | |
| 2500 | 2 | 
                                    
                                    1.9%
                                 | |
| 3000 | 6 | 
                                    
                                    5.8%
                                 | |
| 3500 | 1 | 
                                    
                                    1%
                                 | |
| 4000 | 3 | 
                                    
                                    2.9%
                                 | |
| 4100 | 1 | 
                                    
                                    1%
                                 | |
| 4500 | 1 | 
                                    
                                    1%
                                 | |
| 5000 | 8 | 
                                    
                                    7.7%
                                 | |
| 10000 | 2 | 
                                    
                                    1.9%
                                 | |
| 10500 | 1 | 
                                    
                                    1%
                                 | |
| 18000 | 1 | 
                                    
                                    1%
                                 | |
| 20000 | 4 | 
                                    
                                    3.8%
                                 | |
| 25000 | 2 | 
                                    
                                    1.9%
                                 | |
| 30000 | 1 | 
                                    
                                    1%
                                 | |
| 50000 | 2 | 
                                    
                                    1.9%
                                 | |
| 60000 | 1 | 
                                    
                                    1%
                                 | |
| 250000 | 1 | 
                                    
                                    1%
                                 | |
| Sysmiss | 298 |