| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1 |
0%
|
|
| 1981 | 2 |
0.1%
|
|
| 1982 | 6 |
0.2%
|
|
| 1983 | 2 |
0.1%
|
|
| 1984 | 10 |
0.3%
|
|
| 1985 | 12 |
0.4%
|
|
| 1986 | 35 |
1.1%
|
|
| 1987 | 24 |
0.8%
|
|
| 1988 | 25 |
0.8%
|
|
| 1989 | 32 |
1%
|
|
| 1990 | 49 |
1.5%
|
|
| 1991 | 57 |
1.8%
|
|
| 1992 | 64 |
2%
|
|
| 1993 | 78 |
2.4%
|
|
| 1994 | 63 |
2%
|
|
| 1995 | 90 |
2.8%
|
|
| 1996 | 98 |
3.1%
|
|
| 1997 | 114 |
3.6%
|
|
| 1998 | 124 |
3.9%
|
|
| 1999 | 115 |
3.6%
|
|
| 2000 | 155 |
4.9%
|
|
| 2001 | 107 |
3.4%
|
|
| 2002 | 155 |
4.9%
|
|
| 2003 | 132 |
4.1%
|
|
| 2004 | 140 |
4.4%
|
|
| 2005 | 173 |
5.4%
|
|
| 2006 | 152 |
4.8%
|
|
| 2007 | 161 |
5%
|
|
| 2008 | 186 |
5.8%
|
|
| 2009 | 178 |
5.6%
|
|
| 2010 | 177 |
5.6%
|
|
| 2011 | 115 |
3.6%
|
|
| 2012 | 126 |
4%
|
|
| 2013 | 100 |
3.1%
|
|
| 2014 | 69 |
2.2%
|
|
| 2015 | 9 |
0.3%
|
|
| 9998 | don't know | 53 |
1.7%
|
| Sysmiss | 9726 |