| Value | Category | Cases | |
|---|---|---|---|
| 1954 | 1 |
0.1%
|
|
| 1970 | 1 |
0.1%
|
|
| 1972 | 1 |
0.1%
|
|
| 1973 | 1 |
0.1%
|
|
| 1979 | 7 |
0.7%
|
|
| 1980 | 46 |
4.7%
|
|
| 1981 | 55 |
5.6%
|
|
| 1982 | 46 |
4.7%
|
|
| 1983 | 46 |
4.7%
|
|
| 1984 | 41 |
4.2%
|
|
| 1985 | 25 |
2.5%
|
|
| 1986 | 30 |
3.1%
|
|
| 1987 | 39 |
4%
|
|
| 1988 | 23 |
2.3%
|
|
| 1989 | 22 |
2.2%
|
|
| 1990 | 25 |
2.5%
|
|
| 1991 | 28 |
2.9%
|
|
| 1992 | 25 |
2.5%
|
|
| 1993 | 25 |
2.5%
|
|
| 1994 | 34 |
3.5%
|
|
| 1995 | 23 |
2.3%
|
|
| 1996 | 31 |
3.2%
|
|
| 1997 | 28 |
2.9%
|
|
| 1998 | 27 |
2.8%
|
|
| 1999 | 33 |
3.4%
|
|
| 2000 | 21 |
2.1%
|
|
| 2001 | 33 |
3.4%
|
|
| 2002 | 22 |
2.2%
|
|
| 9999 | 9999. Don't know | 242 |
24.7%
|
| Sysmiss | 18 |