Year Number 1944 3 1945 3 1946 1 1947 2 1948 4 1949 3 1950 8 1951 5 1952 3 1953 4 1954 2 1955 6 1956 2 1957 2 1958 5 1959 2 1960 2 1961 7 1962 1 1963 2 1964 6 1965 1 1966 3 1967 1 1968 0 1969 5 1970 2 1971 1 1972 0 1973 1 1974 2 1975 3 1976 2 1977 1 1978 2 1979 2 1980 2 1981 3 1982 1 1983 1 1984 1 1985 3 1986 0 1987 1 1988 3 1989 2 1990 1 1991 2 1992 1 1993 1 1994 0 1995 5 1996 6 1997 1 1998 3 1999 5 2000 3 2001 4 2002 2 2003 3 2004 6 2005 7 2006 2 2007 2 2008 5 2009 2 2010 5 2011 4 2012 2 2013 0