| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1998 | 9 | 10 |
2.8%
|
|
| 1999 | 141 | 133 |
38.4%
|
|
| 2000 | 135 | 107 |
30.8%
|
|
| 2001 | 84 | 77 |
22.3%
|
|
| 2002 | 17 | 16 |
4.7%
|
|
| 2003 | 2 | 3 |
1%
|
|
| 9997 | inconsistent | 0 | 0 |
0%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 2905 | 2946 |