| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1999 | 73 | 74 |
9.2%
|
|
| 2000 | 119 | 113 |
14%
|
|
| 2001 | 216 | 202 |
24.9%
|
|
| 2002 | 287 | 278 |
34.4%
|
|
| 2003 | 152 | 138 |
17.1%
|
|
| 9997 | inconsistent | 2 | 3 |
0.4%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 2444 | 2485 |