| Year | Count |
|---|---|
| 1937 | 5 |
| 1940 | 10 |
| 1943 | 10 |
| 1946 | 25 |
| 1947 | 45 |
| 1948 | 30 |
| 1949 | 12 |
| 1952 | 7 |
| 1954 | 10 |
| 1955 | 9 |
| 1956 | 8 |
| 1957 | 27 |
| 1958 | 63 |
| 1959 | 46 |
| 1960 | 59 |
| 1961 | 86 |
| 1962 | 88 |
| 1963 | 84 |
| 1964 | 46 |
| 1965 | 23 |
| 1966 | 21 |
| 1967 | 19 |
| 1969 | 8 |
| 1970 | 18 |
| 1972 | 5 |
| 1973 | 5 |
| 1981 | 10 |
| 1982 | 12 |
| 1983 | 18 |
| 1987 | 16 |
| 2002 | 5 |
| 2005 | 10 |