| Value | Category | Cases | |
|---|---|---|---|
| 1974 | 1 |
0.1%
|
|
| 1975 | 1 |
0.1%
|
|
| 1977 | 1 |
0.1%
|
|
| 1978 | 3 |
0.2%
|
|
| 1980 | 1 |
0.1%
|
|
| 1981 | 4 |
0.2%
|
|
| 1982 | 2 |
0.1%
|
|
| 1983 | 5 |
0.3%
|
|
| 1984 | 8 |
0.4%
|
|
| 1985 | 7 |
0.4%
|
|
| 1986 | 21 |
1.1%
|
|
| 1987 | 17 |
0.9%
|
|
| 1988 | 15 |
0.8%
|
|
| 1989 | 20 |
1.1%
|
|
| 1990 | 27 |
1.5%
|
|
| 1991 | 34 |
1.8%
|
|
| 1992 | 37 |
2%
|
|
| 1993 | 38 |
2.1%
|
|
| 1994 | 26 |
1.4%
|
|
| 1995 | 47 |
2.6%
|
|
| 1996 | 39 |
2.1%
|
|
| 1997 | 39 |
2.1%
|
|
| 1998 | 42 |
2.3%
|
|
| 1999 | 83 |
4.5%
|
|
| 2000 | 81 |
4.4%
|
|
| 2001 | 47 |
2.6%
|
|
| 2002 | 60 |
3.3%
|
|
| 2003 | 59 |
3.2%
|
|
| 2004 | 64 |
3.5%
|
|
| 2005 | 75 |
4.1%
|
|
| 2006 | 58 |
3.1%
|
|
| 2007 | 72 |
3.9%
|
|
| 2008 | 88 |
4.8%
|
|
| 2009 | 82 |
4.5%
|
|
| 2010 | 109 |
5.9%
|
|
| 2011 | 83 |
4.5%
|
|
| 2012 | 120 |
6.5%
|
|
| 2013 | 108 |
5.9%
|
|
| 2014 | 115 |
6.2%
|
|
| 2015 | 68 |
3.7%
|
|
| 2016 | 4 |
0.2%
|
|
| 9998 | don't know | 31 |
1.7%
|
| Sysmiss | 11073 |