| Value | Category | Cases | |
|---|---|---|---|
| 1955 | 1 |
0.7%
|
|
| 1960 | 1 |
0.7%
|
|
| 1961 | 3 |
2%
|
|
| 1962 | 1 |
0.7%
|
|
| 1963 | 1 |
0.7%
|
|
| 1964 | 1 |
0.7%
|
|
| 1965 | 3 |
2%
|
|
| 1967 | 2 |
1.3%
|
|
| 1968 | 2 |
1.3%
|
|
| 1969 | 4 |
2.7%
|
|
| 1970 | 7 |
4.7%
|
|
| 1971 | 3 |
2%
|
|
| 1972 | 3 |
2%
|
|
| 1973 | 2 |
1.3%
|
|
| 1974 | 3 |
2%
|
|
| 1975 | 4 |
2.7%
|
|
| 1976 | 5 |
3.4%
|
|
| 1977 | 3 |
2%
|
|
| 1979 | 2 |
1.3%
|
|
| 1980 | 4 |
2.7%
|
|
| 1981 | 6 |
4%
|
|
| 1982 | 7 |
4.7%
|
|
| 1983 | 3 |
2%
|
|
| 1984 | 2 |
1.3%
|
|
| 1985 | 1 |
0.7%
|
|
| 1986 | 2 |
1.3%
|
|
| 1987 | 4 |
2.7%
|
|
| 1988 | 7 |
4.7%
|
|
| 1989 | 1 |
0.7%
|
|
| 1990 | 4 |
2.7%
|
|
| 1992 | 4 |
2.7%
|
|
| 1994 | 3 |
2%
|
|
| 1995 | 2 |
1.3%
|
|
| 1996 | 1 |
0.7%
|
|
| 1997 | 1 |
0.7%
|
|
| 1998 | 5 |
3.4%
|
|
| 2000 | 4 |
2.7%
|
|
| 2001 | 5 |
3.4%
|
|
| 2002 | 2 |
1.3%
|
|
| 2003 | 3 |
2%
|
|
| 2004 | 2 |
1.3%
|
|
| 2005 | 1 |
0.7%
|
|
| 2006 | 1 |
0.7%
|
|
| 2008 | 2 |
1.3%
|
|
| 2009 | 4 |
2.7%
|
|
| 2010 | 2 |
1.3%
|
|
| 2011 | 7 |
4.7%
|
|
| 2012 | 2 |
1.3%
|
|
| 2013 | 2 |
1.3%
|
|
| 9998 | don't know | 4 |
2.7%
|
| Sysmiss | 16281 |