Year	current US$
1975	1185922422.07804
1976	783971929.965406
1977	1013641399.33092
1978	1197430898.29384
1979	1410715459.13923
1980	3707952104.23979
1981	2548255096.98355
1982	2711921502.35547
1983	2195789185.35365
1984	2508042550.51776
1985	2443035903.02476
1986	3491626231.36621
1987	3685020724.57961
1988	4626837525.86045
1989	4911695714.46502
1990	6487851939.87291
1991	5675600694.20689
1992	5961429168.74349
1993	5054536250.33213
1994	5427043341.6621
1995	4833100749.98028
1996	6660906502.39732
1997	6023684029.40752
1998	7641380413.09571
1999	6722133941.38431
2000	6208222150.37112
2001	8908414885.04518
2002	9112209773.14857
2003	11927870304.2821
2004	13846372322.9499
2005	14550262039.9906
2006	16955593977.0543
2007	19667623877.5056
2008	23520805462.0737
2009	19317589542.8478
2010	18945846758.6405
2011	19136984140.6694
2012	15896203523.6845
2013	19277809860.215
2014	19124074589.2276
2015	20780906586.7426
2016	20993679864.1583
2017	22859807112.9715
2018	23002000195.9637
2019	23111642526.728
2020	21545861301.81
2021	26959815044.4573