| Value | Category | Cases | |
|---|---|---|---|
| 99 | Missing | 1 |
2.6%
|
| 1984 | 1 |
2.6%
|
|
| 1985 | 1 |
2.6%
|
|
| 1987 | 1 |
2.6%
|
|
| 1988 | 25 |
65.8%
|
|
| 1989 | 2 |
5.3%
|
|
| 1990 | 1 |
2.6%
|
|
| 1991 | 4 |
10.5%
|
|
| 1993 | 1 |
2.6%
|
|
| 1994 | 1 |
2.6%
|
|
| Sysmiss | 1687 |