| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1990 | 0 |
0%
|
| 1981 | 1981 | 0 |
0%
|
| 1982 | 1982 | 0 |
0%
|
| 1983 | 1983 | 0 |
0%
|
| 1984 | 1984 | 0 |
0%
|
| 1985 | 1985 | 0 |
0%
|
| 1986 | 1986 | 0 |
0%
|
| 1987 | 1987 | 0 |
0%
|
| 1988 | 1988 | 0 |
0%
|
| 1989 | 1989 | 0 |
0%
|
| 1990 | 1990 | 0 |
0%
|
| 1991 | 1991 | 0 |
0%
|
| 1992 | 1992 | 0 |
0%
|
| 1993 | 1993 | 15 |
14.9%
|
| 1994 | 1994 | 13 |
12.9%
|
| 1995 | 1995 | 16 |
15.8%
|
| 1996 | 1996 | 23 |
22.8%
|
| 1997 | 1997 | 33 |
32.7%
|
| 1998 | 1998 | 1 |
1%
|
| 1999 | 1999 | 0 |
0%
|
| 9996 | N/A | 0 |
0%
|
| 9997 | Refuse | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| 9999 | Miss | 0 |
0%
|
| Sysmiss | 14 |