| Value | Category | Cases | |
|---|---|---|---|
| 1981 | 1 |
0.1%
|
|
| 1985 | 1 |
0.1%
|
|
| 1986 | 1 |
0.1%
|
|
| 1988 | 4 |
0.3%
|
|
| 1989 | 6 |
0.4%
|
|
| 1990 | 3 |
0.2%
|
|
| 1991 | 2 |
0.1%
|
|
| 1992 | 4 |
0.3%
|
|
| 1993 | 3 |
0.2%
|
|
| 1994 | 5 |
0.3%
|
|
| 1995 | 12 |
0.8%
|
|
| 1996 | 16 |
1%
|
|
| 1997 | 12 |
0.8%
|
|
| 1998 | 22 |
1.4%
|
|
| 1999 | 26 |
1.7%
|
|
| 2000 | 44 |
2.9%
|
|
| 2001 | 32 |
2.1%
|
|
| 2002 | 51 |
3.3%
|
|
| 2003 | 49 |
3.2%
|
|
| 2004 | 53 |
3.5%
|
|
| 2005 | 64 |
4.2%
|
|
| 2006 | 71 |
4.6%
|
|
| 2007 | 91 |
5.9%
|
|
| 2008 | 99 |
6.4%
|
|
| 2009 | 137 |
8.9%
|
|
| 2010 | 165 |
10.7%
|
|
| 2011 | 337 |
22%
|
|
| 2012 | 95 |
6.2%
|
|
| 9998 | don't know | 41 |
2.7%
|
| 9999 | don't search | 88 |
5.7%
|
| Sysmiss | 47651 |