1950 1686 1955 1921 1960 2150 1961 2140 1962 2191 1963 2300 1964 2402 1965 2564 1966 2678 1967 2689 1968 2790 1969 2924 1970 4112 1971 3165 1972 3295 1973 3481 1974 3590 1975 3743 1976 3852 1977 4019 1978 4072 1979 4214 1980 4388 1981 4541 1982 4550 19834547 1984 4689 1985 4855 1986 4987 1987 5128 1988 5266 1989 5295 1990 5440 1991 5373 1992 5383 1993 5455