Year	current US$
1990	15106125234.9724
1991	14525139971.4353
1992	14174126185.976
1993	11662658564.8257
1994	9632959998.64975
1995	9581979307.87527
1996	8824244482.52257
1997	9659569032.04904
1998	8137649168.57459
1999	6215485388.5954
2000	5721932850.90889
2001	6862411010.90001
2002	7727316093.98532
2003	9347546455.66053
2004	11277179068.2729
2005	13450476559.3008
2006	16069443197.1305
2007	20233841254.1517
2008	24323330263.1513
2009	19113787000.4556
2010	20225971720.9684
2011	22793905538.0772
2012	23313102240.02
2013	25134868009.5084
2014	16496588624.2607
2015	11304069179.2517
2016	12270295444.8502
2017	13541430107.6077
2018	15854561497.0313
2019	19031324480.7627
2020	21108411388.2963
2021	26372112388.8772