Year	current US$
1970	6386973300
1971	7757632100
1972	9127015005.24659
1973	11205198914.354645
1974	12797028170.731709
1975	14614138170.731709
1976	15471561388.55055
1977	15939082289.156628
1978	20017765454.545452
1979	21978962465.753426
1980	22322198055.555557
1981	22625816626.506023
1982	23510460823.52941
1983	24885904074.505238
1984	27037514741.03586
1985	25547692433.6718
1986	27428574994.000477
1987	28186719827.038025
1988	30596877440.633244
1989	30931563116.74997
1990	31425581382.97872
1991	25946030571.857513
1992	22615310675.67568
1993	23198849324.32432
1994	28581097432.432434
1995	31013282650.325546
1996	25517000000
1997	26103200000
1998	26765647400
1999	29157104100
2000	31426024800
2001	32598300000
2002	34153175900
2003	36146412500
2004	37923299600
2005	41503151700
2006	48719477129.62963
2007	52795462962.96297
2008	58431481481.481476
2009	56328703703.703705
2010	56675000000
2011	66750000000
2012	69370000000
2013	74157000000
2014	76709000000
2015	84797000000
2016	88907000000
2017	94063000000
2018	98087000000
2019	101766000000
2020	106650000000