| Value | Category | Cases | |
|---|---|---|---|
| 1974 | 1 |
0.2%
|
|
| 1979 | 1 |
0.2%
|
|
| 1980 | 1 |
0.2%
|
|
| 1981 | 3 |
0.5%
|
|
| 1982 | 2 |
0.4%
|
|
| 1983 | 11 |
1.9%
|
|
| 1984 | 8 |
1.4%
|
|
| 1985 | 7 |
1.2%
|
|
| 1986 | 10 |
1.8%
|
|
| 1987 | 16 |
2.8%
|
|
| 1988 | 13 |
2.3%
|
|
| 1989 | 16 |
2.8%
|
|
| 1990 | 17 |
3%
|
|
| 1991 | 25 |
4.4%
|
|
| 1992 | 13 |
2.3%
|
|
| 1993 | 13 |
2.3%
|
|
| 1994 | 20 |
3.5%
|
|
| 1995 | 12 |
2.1%
|
|
| 1996 | 21 |
3.7%
|
|
| 1997 | 15 |
2.7%
|
|
| 1998 | 29 |
5.1%
|
|
| 1999 | 24 |
4.2%
|
|
| 2000 | 31 |
5.5%
|
|
| 2001 | 29 |
5.1%
|
|
| 2002 | 18 |
3.2%
|
|
| 2003 | 32 |
5.7%
|
|
| 2004 | 30 |
5.3%
|
|
| 2005 | 37 |
6.5%
|
|
| 2006 | 46 |
8.1%
|
|
| 2007 | 64 |
11.3%
|
|
| 9997 | Inconsistent | 1 |
0.2%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 9804 |