| Value | Category | Cases | |
|---|---|---|---|
| 1981 | 1 |
0%
|
|
| 1984 | 1 |
0%
|
|
| 1985 | 2 |
0%
|
|
| 1986 | 7 |
0.1%
|
|
| 1987 | 17 |
0.3%
|
|
| 1988 | 25 |
0.4%
|
|
| 1989 | 32 |
0.5%
|
|
| 1990 | 60 |
0.9%
|
|
| 1991 | 46 |
0.7%
|
|
| 1992 | 95 |
1.5%
|
|
| 1993 | 80 |
1.2%
|
|
| 1994 | 100 |
1.5%
|
|
| 1995 | 93 |
1.4%
|
|
| 1996 | 92 |
1.4%
|
|
| 1997 | 117 |
1.8%
|
|
| 1998 | 117 |
1.8%
|
|
| 1999 | 140 |
2.2%
|
|
| 2000 | 140 |
2.2%
|
|
| 2001 | 142 |
2.2%
|
|
| 2002 | 101 |
1.6%
|
|
| 2003 | 114 |
1.8%
|
|
| 2004 | 114 |
1.8%
|
|
| 2005 | 95 |
1.5%
|
|
| 2006 | 104 |
1.6%
|
|
| 2007 | 117 |
1.8%
|
|
| 2008 | 126 |
1.9%
|
|
| 2009 | 106 |
1.6%
|
|
| 2010 | 122 |
1.9%
|
|
| 2011 | 123 |
1.9%
|
|
| 2012 | 123 |
1.9%
|
|
| 2013 | 112 |
1.7%
|
|
| 2014 | 102 |
1.6%
|
|
| 2015 | 98 |
1.5%
|
|
| 2016 | 96 |
1.5%
|
|
| 2017 | 139 |
2.1%
|
|
| 2018 | 109 |
1.7%
|
|
| 2019 | 101 |
1.6%
|
|
| 2020 | 3 |
0%
|
|
| 9997 | INCONSISTENT | 3 |
0%
|
| 9998 | DK | 42 |
0.6%
|
| 9999 | NO RESPONSE | 4 |
0.1%
|
| Sysmiss | 3122 |
48.2%
|