| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 5 |
1.6%
|
|
| 1996 | 34 |
11%
|
|
| 1997 | 45 |
14.6%
|
|
| 1998 | 57 |
18.4%
|
|
| 1999 | 75 |
24.3%
|
|
| 2000 | 93 |
30.1%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 6083 |