Year	US Dollars adjusted for inflation)
1950	329.3
1951	365.9
1952	370.4
1953	383.1
1954	376.3
1955	381.5
1956	393.1
1957	379.9
1958	373.7
1959	391.7
1960	399
1961	405.7
1962	409.4
1963	414.6
1964	427.5
1965	444.8
1966	450.9
1967	450.6
1968	464.5
1969	480.1
1970	478.7
1971	489.3
1972	497.4
1973	502.2
1974	500
1975	489.3
1976	496.1
1977	490.2
1978	480.1
1979	493.3
1980	505.3
1981	515.2
1982	504.4
1983	520.6
1984	465.9
1985	461.2
1986	463.7
1987	363.9
1988	462.9
1989	429
1990	463.8
1991	437.2
1992	552.3
1993	593.2
1994	595.6
1995	607.5
1996	645.6
1997	668.7
1998	668.7
1999	722.9
2000	725.4
2001	723.4
2002	737.7
2003	687.3