Year	US Dollars adjusted for inflation)
1951	2536
1952	2464
1953	2334
1954	2422
1955	2576
1956	2511
1957	2545
1958	2636
1959	2558
1960	2521
1961	2626
1962	2631
1963	2658
1964	2716
1965	2733
1966	2692
1967	2827
1968	2859
1969	2906
1970	2986
1971	3049
1972	3138
1973	3172
1974	3301
1975	3491
1976	3596
1977	3896
1978	4189
1979	4522
1980	4854
1981	5097
1982	5046
1983	4881
1984	4871
1985	4944
1986	4787
1987	4849
1988	5029
1989	5167
1990	5111
1991	5098
1992	5107
1993	5183
1994	5158
1995	5264
1996	5227
1997	5248
1998	5119
1999	5057
2000	4965
2001	4995
2002	4773
2003	4718