Year	constant 2021 US$
1970	4586879976.689816
1971	4358969981.729984
1972	4646900007.724762
1973	10144760094.642645
1974	16343159762.024883
1975	21086749768.018726
1976	21268709510.743626
1977	23150260513.18647
1978	19909970186.591152
1979	20699570459.276436
1980	21983100221.15709
1981	21732279947.16168
1982	18586279745.101948
1983	16073449982.88156
1984	15189849789.261824
1985	16705069902.896893
1986	13280230022.430426
1987	12373330144.405369
1988	9060259971.14182
1989	8886360048.294075
1990	19795519803.52402
1991	17332609682.08313
1992	11828940120.220179
1993	10630240069.866184
1994	10642240072.488785
1995	7477209940.433505
1996	8166089997.053148
1997	8107249853.610998
1998	9141040045.738222
1999	7708389907.360082
2000	7481300150.871277
2001	8434359970.331202
2002	7797740065.097813
2003	11895850018.024452
2004	14162890194.41605
2005	34729689737.319954
2006	20139009983.06274
2007	20242460247.0398
2008	22683030471.026897
2009	14915189829.856165
2010	12650639998.435995
2011	13150420040.130621
2012	14234010032.65382
2013	21047370124.81691
2014	20538460060.119644
2015	21152599578.85745
2016	27913110103.607197
2017	29821979660.03419
2018	33487960174.560566
2019	30187009757.99563
2020	32811099685.668953
2021	37040410217.28519