| Value | Category | Cases | |
|---|---|---|---|
| 1928 | 1 |
0.2%
|
|
| 1933 | 1 |
0.2%
|
|
| 1934 | 3 |
0.5%
|
|
| 1936 | 5 |
0.9%
|
|
| 1937 | 8 |
1.4%
|
|
| 1938 | 2 |
0.4%
|
|
| 1939 | 3 |
0.5%
|
|
| 1940 | 7 |
1.3%
|
|
| 1942 | 5 |
0.9%
|
|
| 1943 | 7 |
1.3%
|
|
| 1944 | 5 |
0.9%
|
|
| 1945 | 6 |
1.1%
|
|
| 1946 | 6 |
1.1%
|
|
| 1947 | 14 |
2.5%
|
|
| 1948 | 8 |
1.4%
|
|
| 1949 | 4 |
0.7%
|
|
| 1950 | 7 |
1.3%
|
|
| 1951 | 3 |
0.5%
|
|
| 1952 | 11 |
2%
|
|
| 1953 | 13 |
2.4%
|
|
| 1954 | 11 |
2%
|
|
| 1955 | 11 |
2%
|
|
| 1956 | 19 |
3.4%
|
|
| 1957 | 9 |
1.6%
|
|
| 1958 | 10 |
1.8%
|
|
| 1959 | 10 |
1.8%
|
|
| 1960 | 15 |
2.7%
|
|
| 1961 | 13 |
2.4%
|
|
| 1962 | 16 |
2.9%
|
|
| 1963 | 12 |
2.2%
|
|
| 1964 | 11 |
2%
|
|
| 1965 | 24 |
4.3%
|
|
| 1966 | 13 |
2.4%
|
|
| 1967 | 12 |
2.2%
|
|
| 1968 | 8 |
1.4%
|
|
| 1969 | 14 |
2.5%
|
|
| 1970 | 7 |
1.3%
|
|
| 1971 | 8 |
1.4%
|
|
| 1972 | 15 |
2.7%
|
|
| 1973 | 11 |
2%
|
|
| 1974 | 22 |
4%
|
|
| 1975 | 22 |
4%
|
|
| 1976 | 13 |
2.4%
|
|
| 1977 | 15 |
2.7%
|
|
| 1978 | 14 |
2.5%
|
|
| 1979 | 16 |
2.9%
|
|
| 1980 | 18 |
3.3%
|
|
| 1981 | 20 |
3.6%
|
|
| 1982 | 15 |
2.7%
|
|
| 1983 | 21 |
3.8%
|
|
| 1984 | 9 |
1.6%
|
|
| Sysmiss | 11 |