Year	current US$
1970	2312094232.31582
1971	2595361844.61594
1972	3165213340.69433
1973	4032384910.44329
1974	4820405996.04302
1975	5822657031.213
1976	6113501784.60406
1977	6890859627.66455
1978	8250342289.54604
1979	9662314846.39664
1980	10399904311.1775
1981	9339411112.15987
1982	8875130681.42968
1983	8920165325.58741
1984	8525196004.03921
1985	8965869168.24158
1986	12450567762.1115
1987	15904952315.044
1988	17534728622.4927
1989	17549909709.707
1990	22191768223.4482
1991	22928264768.2409
1992	25060799067.4605
1993	24172492256.0164
1994	25826416889.89
1995	30483185769.4296
1996	30488212877.9791
1997	28577485046.446
1998	29282175267.8285
1999	29506321488.4093
2000	26604520547.1112
2001	27488585576.1385
2002	30391528502.4517
2003	37949967373.6888
2004	43420573848.3158
2005	44689089353.8301
2006	46979215711.1143
2007	54643900282.9898
2008	64192542330.2728
2009	58460519680.462
2010	57019865494.0164
2011	60371841144.3067
2012	57397048611.317
2013	59440255227.0286
2014	59545119783.7145
2015	50301528906.3352
2016	51848426619.4111
2017	54290744198.1279
2018	58887006878.0626
2019	58938023310.2671
2020	61638278581.706
2021	66761325048.7306