| Year | Count |
|---|---|
| 1914 | 15 |
| 1915 | 20 |
| 1916 | 20 |
| 1917 | 11 |
| 1918 | 9 |
| 1919 | 19 |
| 1920 | 16 |
| 1921 | 20 |
| 1922 | 12 |
| 1923 | 11 |
| 1924 | 14 |
| 1925 | 9 |
| 1926 | 25 |
| 1927 | 42 |
| 1928 | 32 |
| 1929 | 18 |
| 1930 | 36 |
| 1931 | 28 |
| 1932 | 16 |
| 1933 | 14 |
| 1934 | 16 |
| 1935 | 12 |
| 1936 | 10 |
| 1937 | 12 |
| 1938 | 22 |
| 1939 | 26 |
| 1940 | 10 |
| 1941 | 30 |
| 1942 | 18 |
| 1943 | 10 |
| 1944 | 18 |
| 1945 | 16 |
| 1946 | 14 |
| 1947 | 14 |
| 1948 | 16 |
| 1949 | 16 |
| 1950 | 12 |
| 1952 | 18 |
| 1954 | 16 |
| 1961 | 7 |
| 1963 | 5 |
| 1974 | 5 |
| 1977 | 5 |
| 1978 | 5 |
| 1980 | 7 |
| 1981 | 6 |
| 1987 | 7 |
| 1988 | 5 |
| 1992 | 5 |
| 1994 | 5 |
| 1997 | 5 |
| 1998 | 5 |
| 1999 | 13 |
| 2000 | 5 |
| 2001 | 8 |
| 2002 | 9 |
| 2004 | 9 |
| 2005 | 9 |
| 2006 | 5 |
| 2007 | 5 |