| Value | Category | Cases | |
|---|---|---|---|
| 1929 | 1 |
1.4%
|
|
| 1935 | 1 |
1.4%
|
|
| 1953 | 1 |
1.4%
|
|
| 1954 | 2 |
2.8%
|
|
| 1958 | 1 |
1.4%
|
|
| 1959 | 2 |
2.8%
|
|
| 1961 | 3 |
4.2%
|
|
| 1963 | 1 |
1.4%
|
|
| 1964 | 1 |
1.4%
|
|
| 1965 | 3 |
4.2%
|
|
| 1966 | 2 |
2.8%
|
|
| 1967 | 2 |
2.8%
|
|
| 1968 | 1 |
1.4%
|
|
| 1969 | 2 |
2.8%
|
|
| 1970 | 1 |
1.4%
|
|
| 1971 | 1 |
1.4%
|
|
| 1972 | 2 |
2.8%
|
|
| 1973 | 3 |
4.2%
|
|
| 1974 | 4 |
5.6%
|
|
| 1977 | 1 |
1.4%
|
|
| 1978 | 1 |
1.4%
|
|
| 1980 | 4 |
5.6%
|
|
| 1981 | 2 |
2.8%
|
|
| 1982 | 1 |
1.4%
|
|
| 1984 | 3 |
4.2%
|
|
| 1985 | 3 |
4.2%
|
|
| 1986 | 3 |
4.2%
|
|
| 1987 | 1 |
1.4%
|
|
| 1990 | 1 |
1.4%
|
|
| 1991 | 1 |
1.4%
|
|
| 1992 | 2 |
2.8%
|
|
| 1993 | 2 |
2.8%
|
|
| 1995 | 2 |
2.8%
|
|
| 1996 | 2 |
2.8%
|
|
| 1998 | 2 |
2.8%
|
|
| 1999 | 2 |
2.8%
|
|
| 2001 | 1 |
1.4%
|
|
| 2002 | 1 |
1.4%
|
|
| 2003 | 1 |
1.4%
|
|
| 2004 | 1 |
1.4%
|
|
| 9998 | Don't Know | 1 |
1.4%
|