Year	current US$
1989	25894736842.105263
1990	22000000000
1991	20051282051.28205
1992	17722466960.352425
1993	16988399893.739487
1994	18596691884.246506
1995	22695828944.540695
1996	20341967259.352303
1997	20357121608.802475
1998	17543687391.357243
1999	16960000576.209518
2000	19521222712.336033
2001	19909904878.911415
2002	22030272452.06862
2003	27327869172.16983
2004	39456100770.82159
2005	42593471771.8732
2006	48355049504.9505
2007	61412079207.92079
2008	81376308303.75258
2009	52180910869.129944
2010	65600892379.30304
2011	83661340362.16594
2012	86517143161.41263
2013	81719004128.61253
2014	64873485476.44885
2015	47880176690.92976
2016	46023154798.884476
2017	53943461808.623245
2018	59208892250.91958
2019	63448583044.48005
2020	60801578067.77804
2021	81281413098.76582
2022	57417372455.430046
2023	51099518922.25515