| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1998 | 3 | 4 |
0.5%
|
|
| 1999 | 97 | 91 |
11.9%
|
|
| 2000 | 122 | 119 |
15.5%
|
|
| 2001 | 190 | 178 |
23.1%
|
|
| 2002 | 261 | 250 |
32.5%
|
|
| 2003 | 132 | 126 |
16.4%
|
|
| 9997 | inconsistent | 0 | 0 |
0%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 2488 | 2525 |