| Value | Category | Cases | |
|---|---|---|---|
| 1972 | 2 |
0.1%
|
|
| 1973 | 1 |
0%
|
|
| 1974 | 1 |
0%
|
|
| 1976 | 7 |
0.2%
|
|
| 1977 | 5 |
0.1%
|
|
| 1978 | 11 |
0.3%
|
|
| 1979 | 15 |
0.4%
|
|
| 1980 | 18 |
0.5%
|
|
| 1981 | 15 |
0.4%
|
|
| 1982 | 32 |
0.8%
|
|
| 1983 | 29 |
0.7%
|
|
| 1984 | 38 |
1%
|
|
| 1985 | 46 |
1.2%
|
|
| 1986 | 37 |
1%
|
|
| 1987 | 42 |
1.1%
|
|
| 1988 | 46 |
1.2%
|
|
| 1989 | 53 |
1.4%
|
|
| 1990 | 85 |
2.2%
|
|
| 1991 | 67 |
1.7%
|
|
| 1992 | 80 |
2.1%
|
|
| 1993 | 96 |
2.5%
|
|
| 1994 | 105 |
2.7%
|
|
| 1995 | 110 |
2.8%
|
|
| 1996 | 109 |
2.8%
|
|
| 1997 | 115 |
3%
|
|
| 1998 | 151 |
3.9%
|
|
| 1999 | 137 |
3.5%
|
|
| 2000 | 178 |
4.6%
|
|
| 2001 | 151 |
3.9%
|
|
| 2002 | 157 |
4%
|
|
| 2003 | 168 |
4.3%
|
|
| 2004 | 175 |
4.5%
|
|
| 2005 | 166 |
4.3%
|
|
| 2006 | 166 |
4.3%
|
|
| 2007 | 179 |
4.6%
|
|
| 2008 | 175 |
4.5%
|
|
| 2009 | 163 |
4.2%
|
|
| 2010 | 168 |
4.3%
|
|
| 2011 | 148 |
3.8%
|
|
| 2012 | 147 |
3.8%
|
|
| 2013 | 111 |
2.9%
|
|
| 2014 | 81 |
2.1%
|
|
| 2015 | 21 |
0.5%
|
|
| 9998 | don't know | 86 |
2.2%
|
| Sysmiss | 9022 |