Year	US Dollars adjusted for inflation)
1960	663.6
1961	556.9
1962	596
1963	637
1964	610.6
1965	638
1966	630
1967	689.9
1968	680.7
1969	639.8
1970	805.9
1971	805.7
1972	782.2
1973	825.7
1974	794.3
1975	800.8
1976	852.5
1977	922
1978	914.1
1979	911.4
1980	894.7
1981	933.2
1982	905.6
1983	881.3
1984	857.6
1985	924.2
1986	936.7
1987	939.6
1988	1053
1989	975.7
1990	1066
1991	1101
1992	1104
1993	922.7
1994	848.2
1995	850
1996	767.7
1997	759.2
1998	780.1
1999	823.6
2000	698.8
2001	715.3
2002	760.5
2003	763.7