| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 6 |
0.8%
|
|
| 1992 | 11 |
1.5%
|
|
| 1994 | 17 |
2.3%
|
|
| 1995 | 25 |
3.5%
|
|
| 1996 | 18 |
2.5%
|
|
| 1997 | 13 |
1.8%
|
|
| 1998 | 6 |
0.8%
|
|
| 1999 | 31 |
4.3%
|
|
| 2000 | 24 |
3.3%
|
|
| 2001 | 28 |
3.9%
|
|
| 2002 | 4 |
0.6%
|
|
| 2003 | 19 |
2.6%
|
|
| 2004 | 29 |
4%
|
|
| 2005 | 29 |
4%
|
|
| 2006 | 31 |
4.3%
|
|
| 2007 | 20 |
2.8%
|
|
| 2008 | 27 |
3.7%
|
|
| 2009 | 27 |
3.7%
|
|
| 2010 | 60 |
8.3%
|
|
| 2011 | 47 |
6.5%
|
|
| 2012 | 56 |
7.7%
|
|
| 2013 | 79 |
10.9%
|
|
| 2014 | 71 |
9.8%
|
|
| 2015 | 42 |
5.8%
|
|
| 9998 | don't know | 4 |
0.6%
|
| Sysmiss | 61869 |