| Value | Category | Cases | |
|---|---|---|---|
| 777 | Don't Know | 0 |
0%
|
| 1995 | 1 |
7.1%
|
|
| 1996 | 6 |
42.9%
|
|
| 1997 | 6 |
42.9%
|
|
| 1998 | 1 |
7.1%
|
|
| Sysmiss | 8384 |