Year	constant 2015 US$
1971	7912838767.709448
1972	9019404170.30436
1973	9871739794.110573
1974	10383119654.044363
1975	11590720907.935308
1976	11354710828.006527
1977	11845583460.557877
1978	11934496671.015926
1979	12135790928.665966
1980	12773166433.530853
1981	13051575973.892773
1982	13312075277.781248
1983	13470060726.078234
1984	12713647239.725206
1985	14118392430.940899
1986	15758498077.332613
1987	16767888349.500137
1988	18009060693.04977
1989	18570019205.94717
1990	17216671408.694965
1991	18550027799.230766
1992	20746749007.72267
1993	21895953062.86911
1994	22957555461.259937
1995	24237553629.77561
1996	25902097160.899776
1997	28687840852.502342
1998	31414929263.8328
1999	32654635236.60553
2000	33594398084.020264
2001	34982960032.97279
2002	36139858520.61998
2003	33798317127.50565
2004	34010044609.461468
2005	37897249602.348755
2006	41145459451.15389
2007	43809486145.1568
2008	45849690781.942795
2009	47690729559.85375
2010	51067434087.630455
2011	51624183977.082085
2012	53117492908.910255
2013	54522755995.32971
2014	58277541138.23805
2015	64844273923.540794
2016	69573518159.4897
2017	71377469486.02403
2018	75731765662.24979
2019	79543343784.36992
2020	70044473903.3979
2021	73471431358.88347