| Value | Category | Cases | |
|---|---|---|---|
| 1981 | 1 |
0%
|
|
| 1984 | 6 |
0.2%
|
|
| 1985 | 4 |
0.1%
|
|
| 1986 | 12 |
0.4%
|
|
| 1987 | 22 |
0.6%
|
|
| 1988 | 25 |
0.7%
|
|
| 1989 | 30 |
0.9%
|
|
| 1990 | 39 |
1.2%
|
|
| 1991 | 39 |
1.2%
|
|
| 1992 | 52 |
1.5%
|
|
| 1993 | 51 |
1.5%
|
|
| 1994 | 52 |
1.5%
|
|
| 1995 | 65 |
1.9%
|
|
| 1996 | 63 |
1.9%
|
|
| 1997 | 53 |
1.6%
|
|
| 1998 | 70 |
2.1%
|
|
| 1999 | 67 |
2%
|
|
| 2000 | 70 |
2.1%
|
|
| 2001 | 76 |
2.2%
|
|
| 2002 | 55 |
1.6%
|
|
| 2003 | 87 |
2.6%
|
|
| 2004 | 50 |
1.5%
|
|
| 2005 | 75 |
2.2%
|
|
| 2006 | 83 |
2.4%
|
|
| 2007 | 113 |
3.3%
|
|
| 2008 | 99 |
2.9%
|
|
| 2009 | 119 |
3.5%
|
|
| 2010 | 119 |
3.5%
|
|
| 2011 | 121 |
3.6%
|
|
| 2012 | 132 |
3.9%
|
|
| 2013 | 149 |
4.4%
|
|
| 2014 | 129 |
3.8%
|
|
| 2015 | 118 |
3.5%
|
|
| 2016 | 128 |
3.8%
|
|
| 2017 | 77 |
2.3%
|
|
| 2018 | 50 |
1.5%
|
|
| 2019 | 1 |
0%
|
|
| 9998 | DK | 13 |
0.4%
|
| 9999 | NO RESPONSE | 3 |
0.1%
|
| Sysmiss | 873 |
25.7%
|