| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1998 | 4 | 5 |
1.1%
|
|
| 1999 | 141 | 131 |
30%
|
|
| 2000 | 189 | 161 |
37%
|
|
| 2001 | 121 | 109 |
25%
|
|
| 2002 | 31 | 27 |
6.2%
|
|
| 2003 | 4 | 3 |
0.7%
|
|
| 9997 | inconsistent | 0 | 0 |
0%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 2803 | 2857 |