| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 1 |
0.4%
|
|
| 1992 | 2 |
0.7%
|
|
| 1993 | 1 |
0.4%
|
|
| 1995 | 2 |
0.7%
|
|
| 1996 | 5 |
1.8%
|
|
| 1997 | 5 |
1.8%
|
|
| 1998 | 7 |
2.5%
|
|
| 1999 | 6 |
2.1%
|
|
| 2000 | 17 |
6%
|
|
| 2001 | 11 |
3.9%
|
|
| 2002 | 1 |
0.4%
|
|
| 2003 | 6 |
2.1%
|
|
| 2004 | 9 |
3.2%
|
|
| 2005 | 10 |
3.5%
|
|
| 2006 | 10 |
3.5%
|
|
| 2007 | 8 |
2.8%
|
|
| 2008 | 9 |
3.2%
|
|
| 2009 | 13 |
4.6%
|
|
| 2010 | 20 |
7.1%
|
|
| 2011 | 31 |
11%
|
|
| 2012 | 19 |
6.7%
|
|
| 2013 | 31 |
11%
|
|
| 2014 | 38 |
13.5%
|
|
| 2015 | 18 |
6.4%
|
|
| 9998 | don't know | 2 |
0.7%
|
| Sysmiss | 12633 |