| Value | Category | Cases | |
|---|---|---|---|
| 1979 | 1 |
0.2%
|
|
| 1980 | 2 |
0.4%
|
|
| 1981 | 2 |
0.4%
|
|
| 1982 | 3 |
0.5%
|
|
| 1983 | 1 |
0.2%
|
|
| 1984 | 3 |
0.5%
|
|
| 1985 | 2 |
0.4%
|
|
| 1986 | 5 |
0.9%
|
|
| 1987 | 4 |
0.7%
|
|
| 1988 | 5 |
0.9%
|
|
| 1989 | 16 |
2.9%
|
|
| 1990 | 8 |
1.4%
|
|
| 1991 | 10 |
1.8%
|
|
| 1992 | 10 |
1.8%
|
|
| 1993 | 12 |
2.2%
|
|
| 1994 | 14 |
2.5%
|
|
| 1995 | 17 |
3.1%
|
|
| 1996 | 23 |
4.2%
|
|
| 1997 | 19 |
3.4%
|
|
| 1998 | 33 |
6%
|
|
| 1999 | 31 |
5.6%
|
|
| 2000 | 38 |
6.9%
|
|
| 2001 | 21 |
3.8%
|
|
| 2002 | 24 |
4.3%
|
|
| 2003 | 48 |
8.7%
|
|
| 2004 | 54 |
9.8%
|
|
| 2005 | 38 |
6.9%
|
|
| 2006 | 58 |
10.5%
|
|
| 2007 | 51 |
9.2%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 6645 |