Year	US Dollars adjusted for inflation)
1951	1912
1952	2015
1953	2041
1954	2100
1955	2116
1956	2138
1957	2182
1958	2154
1959	2218
1960	2339
1961	2313
1962	2328
1963	2356
1964	2469
1965	2460
1966	2426
1967	2502
1968	2537
1969	2546
1970	2661
1971	2687
1972	2972
1973	3611
1974	3875
1975	4035
1976	4321
1977	4569
1978	4704
1979	4823
1980	4939
1981	5014
1982	4924
1983	4679
1984	4690
1985	4680
1986	4684
1987	4255
1988	4595
1989	4446
1990	4453
1991	4501
1992	4506
1993	4462
1994	4511
1995	4525
1996	4532
1997	4583
1998	4492
1999	4340
2000	4314
2001	4319
2002	4297
2003	4330
2004	4516