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	71290000.91552731
1991	95069999.69482419
1992	45319998.98888174
1993	111649997.7111817
1994	331720005.0354006
1995	177969997.40600592
1996	398169998.1689452
1997	231720005.03540093
1998	149439998.6267089
1999	157929996.49047852
2000	241360004.42504883
2001	389429992.675781
2002	291289995.19348145
2003	158059997.55859402
2004	145309997.55859402
2005	139600006.10351598
2006	217330001.831055
2007	163919998.168945
2008	222100006.10351598
2009	158809997.55859402
2010	127629997.253418