| Value | Category | Cases | |
|---|---|---|---|
| 1963 | 1 |
0.1%
|
|
| 1972 | 1 |
0.1%
|
|
| 1974 | 1 |
0.1%
|
|
| 1975 | 1 |
0.1%
|
|
| 1976 | 2 |
0.3%
|
|
| 1977 | 4 |
0.6%
|
|
| 1978 | 5 |
0.7%
|
|
| 1979 | 4 |
0.6%
|
|
| 1980 | 12 |
1.7%
|
|
| 1981 | 9 |
1.3%
|
|
| 1982 | 13 |
1.9%
|
|
| 1983 | 16 |
2.3%
|
|
| 1984 | 28 |
4%
|
|
| 1985 | 21 |
3%
|
|
| 1986 | 24 |
3.4%
|
|
| 1987 | 21 |
3%
|
|
| 1988 | 25 |
3.6%
|
|
| 1989 | 21 |
3%
|
|
| 1990 | 23 |
3.3%
|
|
| 1991 | 31 |
4.4%
|
|
| 1992 | 26 |
3.7%
|
|
| 1993 | 33 |
4.7%
|
|
| 1994 | 29 |
4.1%
|
|
| 1995 | 28 |
4%
|
|
| 1996 | 21 |
3%
|
|
| 1997 | 22 |
3.1%
|
|
| 1998 | 19 |
2.7%
|
|
| 1999 | 22 |
3.1%
|
|
| 2000 | 21 |
3%
|
|
| 2001 | 21 |
3%
|
|
| 2002 | 16 |
2.3%
|
|
| 2003 | 24 |
3.4%
|
|
| 2004 | 16 |
2.3%
|
|
| 2005 | 13 |
1.9%
|
|
| 2006 | 15 |
2.1%
|
|
| 2007 | 19 |
2.7%
|
|
| 2008 | 16 |
2.3%
|
|
| 2009 | 12 |
1.7%
|
|
| 2010 | 15 |
2.1%
|
|
| 2011 | 13 |
1.9%
|
|
| 2012 | 20 |
2.9%
|
|
| 2013 | 14 |
2%
|
|
| 2014 | 3 |
0.4%
|
|
| 9998 | don't know | 0 |
0%
|
| Sysmiss | 15729 |