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| Year | Available |
| 1931 | 0 |
| 1932 | 6 |
| 1933 | 1 |
| 1934 | 1 |
| 1935 | 0 |
| 1936 | 0 |
| 1937 | 0 |
| 1938 | 3 |
| 1939 | 3 |
| 1940 | 5 |
| 1941 | 3 |
| 1942 | 3 |
| 1943 | 2 |
| 1944 | 7 |
| 1945 | 5 |
| 1946 | 2 |
| 1947 | 2 |
| 1948 | 4 |
| 1949 | 1 |
| 1950 | 0 |
| 1951 | 0 |
| 1952 | 1 |
| 1953 | 2 |
| 1954 | 1 |
| 1955 | 0 |
| 1956 | 1 |
| 1957 | 1 |
| 1958 | 4 |
| 1959 | 2 |
| 1960 | 0 |
| 1961 | 4 |
| 1962 | 0 |
| 1963 | 0 |
| 1964 | 0 |
| 1965 | 0 |
| 1966 | 0 |
| 1967 | 0 |
| 1968 | 0 |
| 1969 | 17 |
| 1970 | 24 |
| 1971 | 1 |
| 1972 | 2 |
| 1973 | 3 |
| 1974 | 22 |
| 1975 | 9 |
| 1976 | 4 |
| 1977 | 1 |
| 1978 | 3 |
| 1979 | 0 |
| 1980 | 0 |
| 1981 | 31 |
| 1982 | 2 |
| 1983 | 0 |
| 1984 | 15 |
| 1985 | 0 |
| 1986 | 13 |
| 1987 | 1 |
| 1988 | 8 |
| 1989 | 5 |
| 1990 | 6 |
| 1991 | 12 |
| 1992 | 3 |
| 1993 | 7 |
| 1994 | 21 |
| 1995 | 2 |
| 1996 | 0 |
| 1997 | 52 |
| 1998 | 9 |
| 1999 | 3 |
| 2000 | 24 |
| 2001 | 1 |
| 2002 | 27 |
| 2003 | 1 |
| 2004 | 7 |
| 2005 | 4 |
| 2006 | 0 |
| 2007 | 0 |
| 2008 | 8 |
| 2009 | 0 |
| 2010 | 21 |
| 2011 | 1 |
| 2012 | 50 |
| 2013 | 0 |
| 2014 | 4 |
| 2015 | 13 |
| 2016 | 6 |
| 2017 | 0 |
| 2018 | 0 |
| 2019 | 0 |
| 2020 | 0 |