| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1 |
0%
|
|
| 1985 | 2 |
0.1%
|
|
| 1986 | 2 |
0.1%
|
|
| 1987 | 6 |
0.3%
|
|
| 1988 | 3 |
0.1%
|
|
| 1989 | 17 |
0.8%
|
|
| 1990 | 10 |
0.5%
|
|
| 1991 | 8 |
0.4%
|
|
| 1992 | 11 |
0.5%
|
|
| 1993 | 19 |
0.9%
|
|
| 1994 | 24 |
1.1%
|
|
| 1995 | 28 |
1.3%
|
|
| 1996 | 26 |
1.2%
|
|
| 1997 | 33 |
1.5%
|
|
| 1998 | 43 |
2%
|
|
| 1999 | 42 |
2%
|
|
| 2000 | 62 |
2.9%
|
|
| 2001 | 22 |
1%
|
|
| 2002 | 38 |
1.8%
|
|
| 2003 | 38 |
1.8%
|
|
| 2004 | 41 |
1.9%
|
|
| 2005 | 47 |
2.2%
|
|
| 2006 | 50 |
2.3%
|
|
| 2007 | 52 |
2.4%
|
|
| 2008 | 62 |
2.9%
|
|
| 2009 | 69 |
3.2%
|
|
| 2010 | 69 |
3.2%
|
|
| 2011 | 52 |
2.4%
|
|
| 2012 | 58 |
2.7%
|
|
| 2013 | 52 |
2.4%
|
|
| 2014 | 63 |
2.9%
|
|
| 2015 | 67 |
3.1%
|
|
| 2016 | 64 |
3%
|
|
| 2017 | 91 |
4.2%
|
|
| 2018 | 40 |
1.9%
|
|
| 2019 | 2 |
0.1%
|
|
| 9998 | DK | 39 |
1.8%
|
| 9999 | NO RESPONSE | 1 |
0%
|
| Sysmiss | 799 |
37.1%
|