| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1999 | 7 | 8 |
2.2%
|
|
| 2000 | 118 | 113 |
31.2%
|
|
| 2001 | 155 | 133 |
36.7%
|
|
| 2002 | 104 | 95 |
26.3%
|
|
| 2003 | 15 | 13 |
3.5%
|
|
| 9997 | inconsistent | 1 | 0 |
0.1%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 2893 | 2931 |