Year	constant 2015 US$
1970	21964136486.619118
1971	23857246523.740376
1972	25008170184.594425
1973	25855620240.640385
1974	26090844993.7632
1975	28380755014.15374
1976	29907867734.471287
1977	32489962712.48325
1978	34649988074.2523
1979	34941899132.49707
1980	33147286260.41793
1981	39437537465.70845
1982	42843506341.423546
1983	45244925327.51652
1984	48881504962.39393
1985	50482352097.31535
1986	48145502516.55561
1987	47674399171.55172
1988	50005629924.46837
1989	50432554044.540955
1990	50235851867.73128
1991	45006658551.08386
1992	37436505100.03131
1993	32801811478.0775
1994	33144361757.577003
1995	32611360491.741398
1996	34864103675.60925
1997	35638752500.77857
1998	35321931746.083374
1999	37205405622.24968
2000	38135059455.963264
2001	39731096297.80682
2002	40638222801.97848
2003	43072107769.661316
2004	45523759064.59403
2005	49845700030.9666
2006	56756230673.62436
2007	58683918287.5834
2008	57381528622.614426
2009	59429769339.427505
2010	63733929694.37037
2011	63993054821.44162
2012	67292772254.53478
2013	69272417872.17784
2014	71240483964.61618
2015	74925815420.5882
2016	77445264721.09059
2017	78576812141.35944
2018	79335060191.08064
2019	79566803010.14394