Year	US Dollars adjusted for inflation)
1960	786.4
1961	758.1
1962	724.9
1963	750.4
1964	592.4
1965	614.8
1966	617.4
1967	590.9
1968	622.4
1969	617.5
1970	669.8
1971	697
1972	708.8
1973	635
1974	658.4
1975	685.1
1976	721.3
1977	746.3
1978	766.4
1979	796.2
1980	818.6
1981	763.6
1982	713.9
1983	745.6
1984	757.2
1985	729.4
1986	861.8
1987	858.5
1988	829.9
1989	874.4
1990	863.9
1991	874.7
1992	916.6
1993	948.6
1994	921.5
1995	913
1996	992
1997	973.3
1998	1105
1999	1119
2000	1047
2001	1163
2002	1130
2003	1184
2004	1183