Year	US Dollars adjusted for inflation)
1950	839.5
1951	821.4
1952	819.7
1953	857.3
1954	825.2
1955	806.1
1956	837.2
1957	815.5
1958	810.4
1959	821.4
1960	802.6
1961	812.5
1962	823.2
1963	882.8
1964	937.2
1965	990.1
1966	1032
1967	1056
1968	1091
1969	1094
1970	1235
1971	1243
1972	1293
1973	1293
1974	1288
1975	1337
1976	1349
1977	1418
1978	1417
1979	1504
1980	1591
1981	1634
1982	1703
1983	1758
1984	1839
1985	1891
1986	1972
1987	2074
1988	2148
1989	2163
1990	2197
1991	2255
1992	2278
1993	2296
1994	2362
1995	2425
1996	2383
1997	2405
1998	2435
1999	2486
2000	2477
2001	2450
2002	2507
2003	2592
2004	2685