Year	current US$
1970	25419999.599456802
1971	22020000.934600793
1972	22340000.15258786
1973	35569999.69482425
1974	42780000.6866455
1975	64800001.144409195
1976	86459999.0844726
1977	126180002.2125244
1978	87139999.3896485
1979	81709999.0844726
1980	68610000.6103516
1981	93180000.30517581
1982	55959999.0844727
1983	62599998.47412111
1984	28229999.5422363
1985	55190000.5340577
1986	41809999.465942346
1987	39889999.747276284
1988	41379999.16076665
1989	35530001.640319824
1990	1708570025.9208727
1991	4199919967.651372
1992	2564900027.0459847
1993	1876580057.6210017
1994	2943040025.7110596
1995	4636889889.717103
1996	2536729982.3761015
1997	2112369987.4877923
1998	2776200010.299685
1999	3190460016.2506084
2000	3388050031.6619906
2001	3439329993.486405
2002	2584620001.792907
2003	3644569999.6948276
2004	4659490048.885348
2005	123459999.084473
2006	196509994.506836
2007	162910003.66210902
2008	241059997.55859402
2009	168830001.831055
2010	131550003.051758
2011	280000.001192093