| Value | Category | Cases | |
|---|---|---|---|
| 777 | Don't Know | 0 |
0%
|
| 1990 | 1 |
0.3%
|
|
| 1991 | 11 |
3.3%
|
|
| 1992 | 106 |
31.8%
|
|
| 1993 | 109 |
32.7%
|
|
| 1994 | 105 |
31.5%
|
|
| 7777 | 1 |
0.3%
|
|
| Sysmiss | 5248 |