| Value | Category | Cases | |
|---|---|---|---|
| 777 | Don't Know | 0 |
0%
|
| 1989 | 1 |
0.8%
|
|
| 1990 | 1 |
0.8%
|
|
| 1994 | 2 |
1.6%
|
|
| 1995 | 20 |
16.1%
|
|
| 1996 | 42 |
33.9%
|
|
| 1997 | 39 |
31.5%
|
|
| 1998 | 13 |
10.5%
|
|
| 7777 | 6 |
4.8%
|
|
| Sysmiss | 8274 |