Year	constant 2010 US$
1970	17940491442.6636
1971	19703298274.8824
1972	22364944571.1775
1973	24495684728.7802
1974	22791946565.0989
1975	20215700747.0537
1976	20381519880.9609
1977	22827530009.408
1978	24246209516.0746
1979	23920229586.8646
1980	25961962990.8656
1981	27390763616.7845
1982	28009094484.0655
1983	26011515934.5697
1984	21489090625.9823
1985	20726878391.4877
1986	22980048080.9434
1987	27115825284.3675
1988	31137814560.631
1989	32276616161.4283
1990	34731955138.4181
1991	35887944325.1543
1992	37511460642.6523
1993	35432197420.1612
1994	36396816146.61
1995	38781113790.42
1996	40765895883.2618
1997	46578103339.8306
1998	52046463719.0622
1999	55210430703.6824
2000	57458005759.3499
2001	58010391281.4315
2002	56049976876.8333
2003	51949689348.4669
2004	52024617734.9833
2005	52073381983.9237
2006	51632821194.6311
2007	53234384514.5542
2008	53430797720.9589
2009	49385923979.4004
2010	48921225024.6225
2011	42797808415.0347
2012	35684010506.9171
2013	33880045462.9679
2014	34667720022.5191
2015	36691598330.6554
2016	37548579094.9062
2017	40997356539.3981
2018	42861837980.258