Year	current US$
1972	113442257.76716404
1973	146559936.7488729
1974	188717187.48605752
1975	237948326.34447977
1976	267831599.63674745
1977	302371660.8759264
1978	368574118.4341366
1979	471226728.2019104
1980	585115836.6314683
1981	593269620.138773
1982	539197646.3790969
1983	502882816.81592745
1984	514063116.1339184
1985	538302548.7020555
1986	630018061.8818922
1987	867553533.6501954
1988	1167230904.5798519
1989	1241076835.968248
1990	1309195310.3121605
1991	1387437677.6032088
1992	1606128927.7832868
1993	1699788733.183373
1994	1886171136.7923954
1995	2163387692.2954497
1996	2463606827.7245903
1997	2551053647.9707117
1998	2508702291.0867085
1999	2577197336.9084206
2000	2617079829.955415
2001	2289508794.1578097
2002	2204238177.887303
2003	2339157472.712453
2004	2710704330.5044727
2005	3218859109.628581
2006	3639206058.237715
2007	3951038399.447195
2008	4323639850.089577
2009	4159687755.0370607