| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1999 | 92 | 93 |
9.6%
|
|
| 2000 | 130 | 125 |
12.8%
|
|
| 2001 | 262 | 250 |
25.7%
|
|
| 2002 | 334 | 337 |
34.6%
|
|
| 2003 | 171 | 168 |
17.2%
|
|
| 9997 | inconsistent | 0 | 0 |
0%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 2304 | 2320 |