| Value | Category | Cases | |
|---|---|---|---|
| 99 | Mising | 0 |
0%
|
| 1984 | 1 |
2.4%
|
|
| 1988 | 35 |
83.3%
|
|
| 1989 | 3 |
7.1%
|
|
| 1994 | 1 |
2.4%
|
|
| 1995 | 1 |
2.4%
|
|
| 2007 | 1 |
2.4%
|
|
| Sysmiss | 1683 |