Year	US Dollars adjusted for inflation)
1960	1168
1961	1221
1962	1244
1963	1244
1964	1226
1965	1262
1966	1197
1967	1213
1968	1206
1969	1130
1970	1106
1971	1072
1972	1036
1973	890.6
1974	837
1975	1039
1976	1129
1977	1068
1978	1116
1979	1173
1980	1224
1981	1290
1982	1241
1983	1232
1984	1030
1985	1035
1986	1103
1987	1000
1988	988
1989	981.8
1990	997.5
1991	948.4
1992	911.1
1993	871.1
1994	858.5
1995	841.5
1996	805.8
1997	833.8
1998	883.8
1999	884.8
2000	807.5
2001	832.3
2002	826.3
2003	834.8
2004	806.8