Year	US Dollars adjusted for inflation)
1952	334.2
1953	351
1954	349.4
1955	362.7
1956	393.7
1957	402.2
1958	438
1959	441.1
1960	444.9
1961	377.7
1962	371.7
1963	390.5
1964	425.7
1965	462.3
1966	484.9
1967	457.5
1968	432.3
1969	466.7
1970	500
1971	533.9
1972	536.3
1973	561.9
1974	561.5
1975	588.9
1976	591.7
1977	616
1978	667.8
1979	723.6
1980	751
1981	802.7
1982	888.5
1983	944.5
1984	1061
1985	1135
1986	1293
1987	1414
1988	1489
1989	1497
1990	1678
1991	1798
1992	1983
1993	2131
1994	2453
1995	2702
1996	2925
1997	3229
1998	3475
1999	3691
2000	4002
2001	4281
2002	4630
2003	4970
2004	5333