Year	constant 2021 US$
1970	6945600044.786931
1971	7195349990.338088
1972	7157759955.078368
1973	7632759958.781306
1974	10442180001.735685
1975	12191800023.317335
1976	11116660057.067873
1977	12012749947.071077
1978	14041319939.851767
1979	15962770043.849949
1980	16950169967.651375
1981	17782259970.664986
1982	18927199902.534496
1983	18561319887.42762
1984	20060330039.024364
1985	22119940068.244946
1986	21917170050.1442
1987	21595210075.37842
1988	22928019891.738895
1989	24460649894.71435
1990	25412220149.04024
1991	24429150062.56104
1992	24887360155.94006
1993	23940969886.779793
1994	24802789947.509785
1995	21936780121.80328
1996	18980420021.05713
1997	18509149978.637703
1998	18728800010.681164
1999	17223079900.741585
2000	18024290117.26381
2001	20413549923.896786
2002	26182809930.801395
2003	29664600131.034866
2004	28494859994.888325
2005	34708749685.287506
2006	42507699890.13675
2007	33705779542.44615
2008	35456430043.220535
2009	39919140073.77625
2010	40765549884.796165
2011	41063570161.81947
2012	41069060162.54428
2013	42121849807.739265
2014	39201409750.28278
2015	42620059952.73594
2016	41675670135.974884
2017	46101209856.98703
2018	44959960342.40725
2019	47759439994.81205
2020	59734749735.83226
2021	51071700522.23283