| Value | Category | Cases | |
|---|---|---|---|
| 99 | Mising | 0 |
0%
|
| 1982 | 1 |
1.9%
|
|
| 1984 | 1 |
1.9%
|
|
| 1988 | 38 |
71.7%
|
|
| 1989 | 3 |
5.7%
|
|
| 1993 | 2 |
3.8%
|
|
| 1994 | 5 |
9.4%
|
|
| 1995 | 2 |
3.8%
|
|
| 2000 | 1 |
1.9%
|
|
| Sysmiss | 1672 |