| Value | Category | Cases | |
|---|---|---|---|
| 777 | Don't Know | 0 |
0%
|
| 1957 | 1 |
0.4%
|
|
| 1961 | 1 |
0.4%
|
|
| 1969 | 1 |
0.4%
|
|
| 1979 | 1 |
0.4%
|
|
| 1988 | 2 |
0.8%
|
|
| 1989 | 1 |
0.4%
|
|
| 1990 | 1 |
0.4%
|
|
| 1993 | 2 |
0.8%
|
|
| 1994 | 1 |
0.4%
|
|
| 1995 | 51 |
19.4%
|
|
| 1996 | 83 |
31.6%
|
|
| 1997 | 85 |
32.3%
|
|
| 1998 | 25 |
9.5%
|
|
| 7777 | 7 |
2.7%
|
|
| 9999 | 1 |
0.4%
|
|
| Sysmiss | 8135 |