| Year | Count |
|---|---|
| 1915 | 6 |
| 1921 | 5 |
| 1922 | 5 |
| 1923 | 5 |
| 1925 | 16 |
| 1926 | 18 |
| 1927 | 83 |
| 1928 | 36 |
| 1929 | 50 |
| 1930 | 54 |
| 1931 | 43 |
| 1932 | 45 |
| 1933 | 23 |
| 1934 | 16 |
| 1935 | 12 |
| 1936 | 18 |
| 1937 | 12 |
| 1938 | 12 |
| 1940 | 7 |
| 1945 | 6 |
| 1947 | 11 |
| 1951 | 15 |
| 1952 | 5 |
| 1953 | 20 |
| 1954 | 26 |
| 1955 | 47 |
| 1957 | 68 |
| 1958 | 59 |
| 1959 | 66 |
| 1960 | 97 |
| 1961 | 7 |
| 1962 | 18 |
| 1963 | 27 |
| 1964 | 8 |
| 1965 | 6 |
| 1966 | 5 |
| 1967 | 5 |
| 1968 | 10 |
| 1969 | 10 |
| 1973 | 5 |
| 1981 | 5 |
| 1989 | 5 |
| 1990 | 5 |
| 2003 | 31 |
| 2004 | 30 |
| 2005 | 26 |