| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                    
                                    1%
                                 | 
| 0 | 5 | 
                                    
                                    1.7%
                                 | |
| 1 | 25 | 
                                    
                                    8.4%
                                 | |
| 2 | 34 | 
                                    
                                    11.4%
                                 | |
| 3 | 25 | 
                                    
                                    8.4%
                                 | |
| 4 | 28 | 
                                    
                                    9.4%
                                 | |
| 5 | 16 | 
                                    
                                    5.4%
                                 | |
| 6 | 15 | 
                                    
                                    5%
                                 | |
| 7 | 10 | 
                                    
                                    3.3%
                                 | |
| 8 | 13 | 
                                    
                                    4.3%
                                 | |
| 9 | 5 | 
                                    
                                    1.7%
                                 | |
| 10 | 19 | 
                                    
                                    6.4%
                                 | |
| 11 | 3 | 
                                    
                                    1%
                                 | |
| 12 | 6 | 
                                    
                                    2%
                                 | |
| 13 | 5 | 
                                    
                                    1.7%
                                 | |
| 14 | 4 | 
                                    
                                    1.3%
                                 | |
| 15 | 6 | 
                                    
                                    2%
                                 | |
| 16 | 2 | 
                                    
                                    0.7%
                                 | |
| 17 | 1 | 
                                    
                                    0.3%
                                 | |
| 18 | 1 | 
                                    
                                    0.3%
                                 | |
| 20 | 6 | 
                                    
                                    2%
                                 | |
| 22 | 1 | 
                                    
                                    0.3%
                                 | |
| 23 | 1 | 
                                    
                                    0.3%
                                 | |
| 25 | 4 | 
                                    
                                    1.3%
                                 | |
| 27 | 2 | 
                                    
                                    0.7%
                                 | |
| 30 | 6 | 
                                    
                                    2%
                                 | |
| 31 | 1 | 
                                    
                                    0.3%
                                 | |
| 35 | 1 | 
                                    
                                    0.3%
                                 | |
| 36 | 1 | 
                                    
                                    0.3%
                                 | |
| 38 | 1 | 
                                    
                                    0.3%
                                 | |
| 40 | 4 | 
                                    
                                    1.3%
                                 | |
| 41 | 2 | 
                                    
                                    0.7%
                                 | |
| 42 | 2 | 
                                    
                                    0.7%
                                 | |
| 45 | 1 | 
                                    
                                    0.3%
                                 | |
| 47 | 1 | 
                                    
                                    0.3%
                                 | |
| 48 | 1 | 
                                    
                                    0.3%
                                 | |
| 49 | 1 | 
                                    
                                    0.3%
                                 | |
| 50 | 5 | 
                                    
                                    1.7%
                                 | |
| 52 | 1 | 
                                    
                                    0.3%
                                 | |
| 60 | 2 | 
                                    
                                    0.7%
                                 | |
| 62 | 1 | 
                                    
                                    0.3%
                                 | |
| 68 | 1 | 
                                    
                                    0.3%
                                 | |
| 70 | 1 | 
                                    
                                    0.3%
                                 | |
| 74 | 1 | 
                                    
                                    0.3%
                                 | |
| 75 | 2 | 
                                    
                                    0.7%
                                 | |
| 81 | 1 | 
                                    
                                    0.3%
                                 | |
| 90 | 1 | 
                                    
                                    0.3%
                                 | |
| 100 | 1 | 
                                    
                                    0.3%
                                 | |
| 108 | 1 | 
                                    
                                    0.3%
                                 | |
| 113 | 1 | 
                                    
                                    0.3%
                                 | |
| 125 | 1 | 
                                    
                                    0.3%
                                 | |
| 135 | 2 | 
                                    
                                    0.7%
                                 | |
| 150 | 1 | 
                                    
                                    0.3%
                                 | |
| 185 | 1 | 
                                    
                                    0.3%
                                 | |
| 200 | 2 | 
                                    
                                    0.7%
                                 | |
| 245 | 1 | 
                                    
                                    0.3%
                                 | |
| 300 | 1 | 
                                    
                                    0.3%
                                 | |
| 302 | 1 | 
                                    
                                    0.3%
                                 | |
| 330 | 1 | 
                                    
                                    0.3%
                                 | |
| 350 | 1 | 
                                    
                                    0.3%
                                 | |
| 371 | 1 | 
                                    
                                    0.3%
                                 | |
| 400 | 1 | 
                                    
                                    0.3%
                                 | |
| 500 | 1 | 
                                    
                                    0.3%
                                 | |
| 540 | 1 | 
                                    
                                    0.3%
                                 | |
| 576 | 1 | 
                                    
                                    0.3%
                                 | |
| 603 | 1 | 
                                    
                                    0.3%
                                 | |
| Sysmiss | 313 |