Year	US Dollars adjusted for inflation)
1951	1725
1952	1733
1953	1671
1954	1723
1955	1761
1956	1889
1957	1955
1958	2013
1959	2043
1960	2125
1961	2043
1962	2481
1963	2630
1964	2717
1965	2413
1966	2522
1967	2427
1968	2345
1969	2452
1970	2761
1971	2875
1972	3017
1973	3232
1974	3403
1975	3355
1976	3426
1977	3511
1978	3553
1979	3613
1980	3922
1981	4210
1982	4331
1983	4404
1984	4337
1985	4197
1986	4269
1987	4327
1988	4328
1989	4374
1990	4135
1991	4188
1992	4584
1993	4781
1994	4921
1995	4994
1996	5325
1997	5589
1998	5936
1999	6172
2000	6497
2001	6803
2002	7158
2003	6899