| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1999 | 21 | 20 |
6.1%
|
|
| 2000 | 59 | 52 |
16.1%
|
|
| 2001 | 89 | 77 |
23.7%
|
|
| 2002 | 118 | 109 |
33.6%
|
|
| 2003 | 71 | 66 |
20.5%
|
|
| 9997 | inconsistent | 0 | 0 |
0%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 2935 | 2968 |