| Year | Count |
|---|---|
| 1913 | 10 |
| 1914 | 11 |
| 1915 | 21 |
| 1916 | 11 |
| 1917 | 15 |
| 1918 | 12 |
| 1919 | 9 |
| 1920 | 9 |
| 1921 | 24 |
| 1922 | 16 |
| 1923 | 14 |
| 1924 | 24 |
| 1925 | 30 |
| 1926 | 28 |
| 1927 | 37 |
| 1928 | 41 |
| 1929 | 36 |
| 1930 | 38 |
| 1931 | 42 |
| 1932 | 49 |
| 1933 | 44 |
| 1934 | 44 |
| 1935 | 45 |
| 1936 | 59 |
| 1937 | 58 |
| 1938 | 52 |
| 1939 | 58 |
| 1940 | 49 |
| 1941 | 44 |
| 1942 | 61 |
| 1943 | 72 |
| 1944 | 89 |
| 1945 | 86 |
| 1946 | 101 |
| 1947 | 113 |
| 1948 | 89 |
| 1949 | 44 |
| 1950 | 51 |
| 1951 | 43 |
| 1952 | 36 |
| 1953 | 34 |
| 1954 | 59 |
| 1955 | 62 |
| 1956 | 69 |
| 1957 | 135 |
| 1958 | 200 |
| 1959 | 209 |
| 1960 | 206 |
| 1961 | 175 |
| 1962 | 148 |
| 1963 | 114 |
| 1964 | 104 |
| 1965 | 87 |
| 1966 | 55 |
| 1967 | 38 |
| 1968 | 34 |
| 1969 | 43 |
| 1970 | 40 |
| 1971 | 35 |
| 1972 | 23 |
| 1973 | 24 |
| 1974 | 16 |
| 1975 | 16 |
| 1976 | 20 |
| 1977 | 19 |
| 1978 | 8 |
| 1979 | 9 |
| 1980 | 11 |
| 1981 | 14 |
| 1982 | 17 |
| 1983 | 10 |
| 1985 | 7 |
| 1987 | 7 |
| 1989 | 7 |
| 1990 | 12 |
| 1991 | 6 |
| 1992 | 10 |
| 1993 | 15 |
| 1994 | 9 |
| 1995 | 7 |
| 1996 | 13 |
| 1997 | 7 |
| 1998 | 8 |
| 1999 | 7 |
| 2000 | 11 |
| 2001 | 12 |
| 2003 | 11 |
| 2004 | 9 |
| 2005 | 10 |
| 2006 | 8 |
| 2007 | 6 |
| 2009 | 5 |
| 2010 | 6 |
| 2012 | 6 |