| Value | Category | Cases | |
|---|---|---|---|
| 1986 | 1 |
0.2%
|
|
| 1987 | 1 |
0.2%
|
|
| 1988 | 4 |
0.6%
|
|
| 1989 | 6 |
0.9%
|
|
| 1990 | 17 |
2.6%
|
|
| 1991 | 22 |
3.4%
|
|
| 1992 | 10 |
1.5%
|
|
| 1993 | 26 |
4%
|
|
| 1994 | 13 |
2%
|
|
| 1995 | 20 |
3.1%
|
|
| 1996 | 23 |
3.6%
|
|
| 1997 | 19 |
2.9%
|
|
| 1998 | 27 |
4.2%
|
|
| 1999 | 19 |
2.9%
|
|
| 2000 | 36 |
5.6%
|
|
| 2001 | 10 |
1.5%
|
|
| 2002 | 25 |
3.9%
|
|
| 2003 | 24 |
3.7%
|
|
| 2004 | 27 |
4.2%
|
|
| 2005 | 30 |
4.6%
|
|
| 2006 | 30 |
4.6%
|
|
| 2007 | 30 |
4.6%
|
|
| 2008 | 35 |
5.4%
|
|
| 2009 | 34 |
5.3%
|
|
| 2010 | 22 |
3.4%
|
|
| 2011 | 31 |
4.8%
|
|
| 2012 | 23 |
3.6%
|
|
| 2013 | 25 |
3.9%
|
|
| 2014 | 20 |
3.1%
|
|
| 2015 | 25 |
3.9%
|
|
| 2016 | 7 |
1.1%
|
|
| 9998 | DK | 5 |
0.8%
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 351 |