Year	constant 2021 US$
1970	190249996.1853032
1971	140860000.6103517
1972	126180004.1198731
1973	184680007.93457067
1974	196300003.0517578
1975	252209999.08447298
1976	326300003.051758
1977	430059997.55859405
1978	264110000.610351
1979	215160003.66210932
1980	167610004.4250485
1981	266119995.11718696
1982	153720001.2207031
1983	175580005.6457522
1984	76209999.0844726
1985	136979999.5422363
1986	87369998.93188481
1987	75949998.14033507
1988	72970002.65121466
1989	63299996.37603757
1990	2651149945.2590947
1991	6703770046.710969
1992	3575209975.4903483
1993	2707420021.057132
1994	4287090080.2612295
1995	5439890209.197998
1996	3237489982.6049843
1997	2987280010.2233872
1998	3966939994.812015
1999	4730670009.613042
2000	5590669948.577887
2001	5729240036.010748
2002	3994929925.918579
2003	4688289987.564091
2004	5368880095.005041
2005	139600006.10351598
2006	217330001.831055
2007	163919998.168945
2008	222100006.10351598
2009	158809997.55859402
2010	127629997.253418
2011	250000