| Value | Category | Cases | |
|---|---|---|---|
| 99 | Missing | 0 |
0%
|
| 1984 | 1 |
3.1%
|
|
| 1985 | 1 |
3.1%
|
|
| 1988 | 22 |
68.8%
|
|
| 1989 | 4 |
12.5%
|
|
| 1991 | 2 |
6.3%
|
|
| 1994 | 1 |
3.1%
|
|
| 1995 | 1 |
3.1%
|
|
| Sysmiss | 1693 |