| Value | Category | Cases | |
|---|---|---|---|
| 1989 | 1 |
7.7%
|
|
| 1990 | 1 |
7.7%
|
|
| 1993 | 1 |
7.7%
|
|
| 1995 | 2 |
15.4%
|
|
| 1996 | 2 |
15.4%
|
|
| 1997 | 1 |
7.7%
|
|
| 1998 | 1 |
7.7%
|
|
| 1999 | 3 |
23.1%
|
|
| 2000 | 1 |
7.7%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 15338 |