Year	US Dollars adjusted for inflation)
1960	1373
1961	1496
1962	1404
1963	1326
1964	1434
1965	1374
1966	1641
1967	1962
1968	2056
1969	1959
1970	2098
1971	2091
1972	2156
1973	1997
1974	2080
1975	1849
1976	1889
1977	1899
1978	1899
1979	1922
1980	1930
1981	2055
1982	2108
1983	2372
1984	2493
1985	2720
1986	2765
1987	2751
1988	2933
1989	2966
1990	2861
1991	2944
1992	2966
1993	3174
1994	3111
1995	3490
1996	3523
1997	3890
1998	4176
1999	4487
2000	4983
2001	4810
2002	4939
2003	5120