| Value | Category | Cases | |
|---|---|---|---|
| 99 | Missing | 1 |
2.3%
|
| 1984 | 1 |
2.3%
|
|
| 1987 | 1 |
2.3%
|
|
| 1988 | 30 |
68.2%
|
|
| 1989 | 2 |
4.5%
|
|
| 1991 | 3 |
6.8%
|
|
| 1994 | 2 |
4.5%
|
|
| 1995 | 1 |
2.3%
|
|
| 1996 | 1 |
2.3%
|
|
| 1998 | 1 |
2.3%
|
|
| 2010 | 1 |
2.3%
|
|
| Sysmiss | 1681 |