Year	US Dollars adjusted for inflation)
1955	476.2
1956	575.7
1957	596.6
1958	633.5
1959	505.1
1960	372.1
1961	456.3
1962	661.3
1963	527.6
1964	680.4
1965	314.2
1966	677
1967	675.8
1968	844.7
1969	828.7
1970	1041
1971	1129
1972	1432
1973	1296
1974	1239
1975	1078
1976	1065
1977	957.6
1978	1181
1979	1190
1980	1140
1981	1130
1982	1181
1983	1042
1984	1079
1985	1014
1986	1094
1987	1091
1988	1136
1989	1152
1990	1153
1991	1156
1992	1195
1993	1194
1994	1167
1995	1224
1996	1225
1997	1127
1998	1205
1999	1221
2000	1392
2001	1373
2002	1449
2003	1440