Year	US Dollars adjusted for inflation)
1960	480.4
1961	471.9
1962	467.7
1963	546.7
1964	587.3
1965	630.1
1966	568.1
1967	640.7
1968	661.3
1969	729.8
1970	690.1
1971	678.4
1972	625.5
1973	632.4
1974	663.8
1975	761.5
1976	719.1
1977	705.9
1978	651.2
1979	655.6
1980	505.4
1981	635.7
1982	631.4
1983	632.3
1984	654.8
1985	628.9
1986	634.6
1987	619.8
1988	603.6
1989	639
1990	641.8
1991	643.9
1992	454.3
1993	541
1994	623.2
1995	631.5
1996	667
1997	671.3
1998	492
1999	543.1
2000	762.4
2001	576.7
2002	548.1
2003	582.8