| Value | Category | Cases | |
|---|---|---|---|
| 1983 | 1 |
0.1%
|
|
| 1984 | 1 |
0.1%
|
|
| 1985 | 4 |
0.4%
|
|
| 1986 | 2 |
0.2%
|
|
| 1987 | 2 |
0.2%
|
|
| 1988 | 4 |
0.4%
|
|
| 1989 | 5 |
0.5%
|
|
| 1990 | 6 |
0.6%
|
|
| 1991 | 9 |
0.9%
|
|
| 1992 | 7 |
0.7%
|
|
| 1993 | 7 |
0.7%
|
|
| 1994 | 18 |
1.7%
|
|
| 1995 | 13 |
1.2%
|
|
| 1996 | 16 |
1.5%
|
|
| 1997 | 10 |
1%
|
|
| 1998 | 17 |
1.6%
|
|
| 1999 | 20 |
1.9%
|
|
| 2000 | 19 |
1.8%
|
|
| 2001 | 18 |
1.7%
|
|
| 2002 | 14 |
1.3%
|
|
| 2003 | 19 |
1.8%
|
|
| 2004 | 20 |
1.9%
|
|
| 2005 | 23 |
2.2%
|
|
| 2006 | 24 |
2.3%
|
|
| 2007 | 22 |
2.1%
|
|
| 2008 | 20 |
1.9%
|
|
| 2009 | 23 |
2.2%
|
|
| 2010 | 15 |
1.4%
|
|
| 2011 | 23 |
2.2%
|
|
| 2012 | 22 |
2.1%
|
|
| 2013 | 19 |
1.8%
|
|
| 2014 | 24 |
2.3%
|
|
| 2015 | 18 |
1.7%
|
|
| 2016 | 12 |
1.1%
|
|
| 2017 | 1 |
0.1%
|
|
| 2018 | 1 |
0.1%
|
|
| 9998 | DK | 7 |
0.7%
|
| 9999 | NO RESPONSE | 2 |
0.2%
|
| Sysmiss | 560 |
53.4%
|