1950 11
1955 15
1960 20
1961 20
1962 20
1963 20
1964 21
1965 21
1966 22
1967 23
1968 24
1969 25
1970 36
1971 39
1972 46
1973 52
1974 52
1975 43
1976 47
1977 49
1978 51
1979 54
1980 62
1981 65
1982 69
1983 74
1984 76
1985 79
1986 84
1987 98
1988 105
1989 95
1990 90
1991 96
1992 103
1993 108