| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1998 | 26 | 30 |
2.3%
|
|
| 1999 | 124 | 115 |
9%
|
|
| 2000 | 190 | 194 |
15.2%
|
|
| 2001 | 307 | 299 |
23.4%
|
|
| 2002 | 432 | 419 |
32.7%
|
|
| 2003 | 235 | 222 |
17.4%
|
|
| 9997 | inconsistent | 0 | 0 |
0%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 1979 | 2015 |