| Value | Category | Cases | |
|---|---|---|---|
| 1983 | 1 |
0.4%
|
|
| 1985 | 1 |
0.4%
|
|
| 1988 | 1 |
0.4%
|
|
| 1989 | 1 |
0.4%
|
|
| 1992 | 1 |
0.4%
|
|
| 1993 | 1 |
0.4%
|
|
| 1994 | 4 |
1.7%
|
|
| 1995 | 2 |
0.8%
|
|
| 1996 | 5 |
2.1%
|
|
| 1997 | 1 |
0.4%
|
|
| 1998 | 15 |
6.2%
|
|
| 2000 | 10 |
4.1%
|
|
| 2001 | 7 |
2.9%
|
|
| 2002 | 8 |
3.3%
|
|
| 2003 | 7 |
2.9%
|
|
| 2004 | 12 |
5%
|
|
| 2005 | 17 |
7.1%
|
|
| 2006 | 11 |
4.6%
|
|
| 2007 | 11 |
4.6%
|
|
| 2008 | 17 |
7.1%
|
|
| 9999 | Do not know | 108 |
44.8%
|
| Sysmiss | 2595 |