| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    0.8%
                                 | 
| 0 | 2 | 
                                    
                                    1.5%
                                 | |
| 1 | 2 | 
                                    
                                    1.5%
                                 | |
| 3 | 3 | 
                                    
                                    2.3%
                                 | |
| 4 | 6 | 
                                    
                                    4.5%
                                 | |
| 5 | 4 | 
                                    
                                    3%
                                 | |
| 6 | 8 | 
                                    
                                    6%
                                 | |
| 7 | 2 | 
                                    
                                    1.5%
                                 | |
| 8 | 5 | 
                                    
                                    3.8%
                                 | |
| 9 | 5 | 
                                    
                                    3.8%
                                 | |
| 10 | 6 | 
                                    
                                    4.5%
                                 | |
| 11 | 4 | 
                                    
                                    3%
                                 | |
| 12 | 3 | 
                                    
                                    2.3%
                                 | |
| 13 | 1 | 
                                    
                                    0.8%
                                 | |
| 14 | 2 | 
                                    
                                    1.5%
                                 | |
| 15 | 5 | 
                                    
                                    3.8%
                                 | |
| 16 | 4 | 
                                    
                                    3%
                                 | |
| 17 | 4 | 
                                    
                                    3%
                                 | |
| 18 | 3 | 
                                    
                                    2.3%
                                 | |
| 19 | 4 | 
                                    
                                    3%
                                 | |
| 20 | 6 | 
                                    
                                    4.5%
                                 | |
| 21 | 1 | 
                                    
                                    0.8%
                                 | |
| 22 | 1 | 
                                    
                                    0.8%
                                 | |
| 23 | 1 | 
                                    
                                    0.8%
                                 | |
| 24 | 1 | 
                                    
                                    0.8%
                                 | |
| 25 | 2 | 
                                    
                                    1.5%
                                 | |
| 26 | 1 | 
                                    
                                    0.8%
                                 | |
| 27 | 2 | 
                                    
                                    1.5%
                                 | |
| 30 | 5 | 
                                    
                                    3.8%
                                 | |
| 32 | 4 | 
                                    
                                    3%
                                 | |
| 34 | 4 | 
                                    
                                    3%
                                 | |
| 36 | 1 | 
                                    
                                    0.8%
                                 | |
| 37 | 1 | 
                                    
                                    0.8%
                                 | |
| 38 | 1 | 
                                    
                                    0.8%
                                 | |
| 40 | 1 | 
                                    
                                    0.8%
                                 | |
| 43 | 3 | 
                                    
                                    2.3%
                                 | |
| 47 | 2 | 
                                    
                                    1.5%
                                 | |
| 50 | 1 | 
                                    
                                    0.8%
                                 | |
| 51 | 1 | 
                                    
                                    0.8%
                                 | |
| 54 | 1 | 
                                    
                                    0.8%
                                 | |
| 62 | 1 | 
                                    
                                    0.8%
                                 | |
| 65 | 1 | 
                                    
                                    0.8%
                                 | |
| 75 | 1 | 
                                    
                                    0.8%
                                 | |
| 80 | 1 | 
                                    
                                    0.8%
                                 | |
| 90 | 2 | 
                                    
                                    1.5%
                                 | |
| 93 | 2 | 
                                    
                                    1.5%
                                 | |
| 94 | 1 | 
                                    
                                    0.8%
                                 | |
| 95 | 1 | 
                                    
                                    0.8%
                                 | |
| 108 | 1 | 
                                    
                                    0.8%
                                 | |
| 110 | 1 | 
                                    
                                    0.8%
                                 | |
| 125 | 1 | 
                                    
                                    0.8%
                                 | |
| 140 | 1 | 
                                    
                                    0.8%
                                 | |
| 147 | 1 | 
                                    
                                    0.8%
                                 | |
| 180 | 1 | 
                                    
                                    0.8%
                                 | |
| 274 | 1 | 
                                    
                                    0.8%
                                 | |
| 398 | 1 | 
                                    
                                    0.8%
                                 | |
| 1784 | 1 | 
                                    
                                    0.8%
                                 | |
| Sysmiss | 178 |