Year	constant 2010 US$
1968	31795655130.3785
1969	31947446262.9056
1970	33054227898.7277
1971	34302691316.6305
1972	36461075296.3171
1973	35805995095.6109
1974	37698947852.9362
1975	38079502822.5969
1976	42164501743.5026
1977	42699434370.6486
1978	43606343595.1581
1979	44275856859.5013
1980	46556857524.2721
1981	46136592443.8777
1982	49553677860.9598
1983	50336236304.0618
1984	54062115445.3514
1985	59261189670.7063
1986	63339945761.6966
1987	63909339310.8642
1988	67669877679.6262
1989	71174295800.8876
1990	75273208589.984
1991	78611444330.1634
1992	80843541756.5083
1993	81153445438.3533
1994	85981844519.5482
1995	84647860394.6698
1996	92242775667.2013
1997	90771308367.4309
1998	98161073061.4889
1999	97371339725.8517
2000	97385346597.2172
2001	100220699936.7
2002	106384779743.06
2003	109940727084.053
2004	114641672102.397
2005	120833536094.827
2006	128342203756.145
2007	125797285720.88
2008	119419808047.568
2009	129479775681.565
2010	135384003261.672
2011	143038344812.214
2012	145559306458.728
2013	153909453335.508
2014	157906169326.126
2015	160560756575.807
2016	161761602989.982
2017	167007445555.021