Year US Dollars adjusted for inflation) 1950 1803 1951 1827 1952 1943 1953 2036 1954 2100 1955 2180 1956 2214 1957 2350 1958 2428 1959 2534 1960 2670 1961 2943 1962 2996 1963 3100 1964 3117 1965 3198 1966 3225 1967 3321 1968 3569 1969 3709 1970 3976 1971 4250 1972 4604 1973 5069 1974 5277 1975 5482 1976 5903 1977 5976 1978 6038 1979 6326 1980 6669 1981 6293 1982 6270 1983 5965 1984 6056 1985 6515 1986 6919 1987 7215 1988 7079 1989 7337 1990 6834 1991 6788 1992 6665 1993 6774 1994 6977 1995 6895 1996 6954 1997 7030 1998 6964 1999 7018 2000 7194 2001 7108 2002 6950 2003 7204