| Value | Category | Cases | |
|---|---|---|---|
| 1949 | 1 |
0.2%
|
|
| 1952 | 1 |
0.2%
|
|
| 1954 | 1 |
0.2%
|
|
| 1955 | 1 |
0.2%
|
|
| 1957 | 3 |
0.5%
|
|
| 1961 | 2 |
0.3%
|
|
| 1963 | 2 |
0.3%
|
|
| 1964 | 3 |
0.5%
|
|
| 1966 | 4 |
0.7%
|
|
| 1967 | 6 |
1%
|
|
| 1968 | 3 |
0.5%
|
|
| 1969 | 1 |
0.2%
|
|
| 1970 | 3 |
0.5%
|
|
| 1971 | 2 |
0.3%
|
|
| 1972 | 2 |
0.3%
|
|
| 1973 | 8 |
1.4%
|
|
| 1974 | 20 |
3.4%
|
|
| 1975 | 12 |
2.1%
|
|
| 1976 | 16 |
2.7%
|
|
| 1977 | 10 |
1.7%
|
|
| 1978 | 6 |
1%
|
|
| 1979 | 10 |
1.7%
|
|
| 1980 | 11 |
1.9%
|
|
| 1981 | 7 |
1.2%
|
|
| 1982 | 7 |
1.2%
|
|
| 1983 | 15 |
2.6%
|
|
| 1984 | 20 |
3.4%
|
|
| 1985 | 12 |
2.1%
|
|
| 1986 | 19 |
3.3%
|
|
| 1987 | 16 |
2.7%
|
|
| 1988 | 15 |
2.6%
|
|
| 1989 | 18 |
3.1%
|
|
| 1990 | 31 |
5.3%
|
|
| 1991 | 12 |
2.1%
|
|
| 1992 | 19 |
3.3%
|
|
| 1993 | 14 |
2.4%
|
|
| 1994 | 16 |
2.7%
|
|
| 1995 | 10 |
1.7%
|
|
| 1996 | 17 |
2.9%
|
|
| 1997 | 11 |
1.9%
|
|
| 1998 | 18 |
3.1%
|
|
| 1999 | 13 |
2.2%
|
|
| 2000 | 13 |
2.2%
|
|
| 2001 | 8 |
1.4%
|
|
| 2002 | 10 |
1.7%
|
|
| 2003 | 15 |
2.6%
|
|
| 2004 | 10 |
1.7%
|
|
| 2005 | 14 |
2.4%
|
|
| 2006 | 15 |
2.6%
|
|
| 2007 | 10 |
1.7%
|
|
| 2008 | 18 |
3.1%
|
|
| 2009 | 17 |
2.9%
|
|
| 2010 | 17 |
2.9%
|
|
| 2011 | 13 |
2.2%
|
|
| 2012 | 3 |
0.5%
|
|
| 9998 | don't know | 3 |
0.5%
|
| Sysmiss | 48602 |