| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 2 |
0.3%
|
|
| 1992 | 2 |
0.3%
|
|
| 1993 | 5 |
0.8%
|
|
| 1994 | 11 |
1.8%
|
|
| 1995 | 8 |
1.3%
|
|
| 1996 | 18 |
3%
|
|
| 1997 | 11 |
1.8%
|
|
| 1998 | 18 |
3%
|
|
| 1999 | 14 |
2.3%
|
|
| 2000 | 35 |
5.8%
|
|
| 2001 | 20 |
3.3%
|
|
| 2002 | 26 |
4.3%
|
|
| 2003 | 35 |
5.8%
|
|
| 2004 | 44 |
7.3%
|
|
| 2005 | 56 |
9.3%
|
|
| 2006 | 61 |
10.1%
|
|
| 2007 | 60 |
10%
|
|
| 2008 | 47 |
7.8%
|
|
| 2009 | 79 |
13.1%
|
|
| 2010 | 25 |
4.1%
|
|
| 2011 | 13 |
2.2%
|
|
| 2012 | 9 |
1.5%
|
|
| 9998 | Don't know | 4 |
0.7%
|
| Sysmiss | 936 |