| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1999 | 8 | 11 |
3.3%
|
|
| 2000 | 112 | 105 |
30.7%
|
|
| 2001 | 147 | 129 |
37.5%
|
|
| 2002 | 92 | 86 |
25.1%
|
|
| 2003 | 15 | 11 |
3.3%
|
|
| 9997 | inconsistent | 1 | 0 |
0.1%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 2918 | 2949 |