Year	current US$
1977	462229733.281778
1978	876789792.447467
1979	1026477534.33289
1980	1126593868.05079
1981	926003609.994843
1982	507824309.335593
1983	401706298.633855
1984	433122128.091359
1985	315515973.508966
1986	250210455.480173
1987	224101501.762488
1988	363679110.124973
1989	551818904.549858
1990	965147859.964746
1991	886310881.922844
1992	1052587670.55613
1993	1162592955.30017
1994	370885615.566467
1995	189062408.901333
1996	229552040.438757
1997	239890020.22238
1998	251799815.845296
1999	979617297.735171
2000	1832948553.2233
2001	1653267404.61876
2002	2523770923.41006
2003	3473114364.50428
2004	3336004128.28771
2005	1432765185.1212401
2006	2056668730.810584
2007	1097678455.144622
2008	1833045206.4179628
2009	1759926453.8890371
2010	2619372316.374917
2011	2313948391.07045
2012	2067293874.6761048
2013	1916435215.867533
2014	1507440065.7688
2015	2673338417.707551
2016	3244834602.315232
2017	4548953841.254307
2018	4351053348.62233
2019	4486237498.627047
2020	3532610325.195631
2021	3532116623.578609
2022	4408199241.4823675
2023	3963706000.974413