Year	current US$
1990	3571250000
1991	3083333333.3333335
1992	2320435308.34341
1993	2371711383.172701
1994	1702292855.6026738
1995	1752979926.41489
1996	1695122173.9130435
1997	1930081168.831169
1998	1698717504.6554935
1999	1170782957.3744323
2000	1288429391.7995076
2001	1480673594.0560203
2002	1661818168.4226036
2003	1980907434.768264
2004	2598249555.89984
2005	2988342907.0309634
2006	3408255450.5509
2007	4401173151.937674
2008	6054824248.242213
2009	5439434271.7880745
2010	6974982369.601547
2011	8414352020.494416
2012	8709138634.82921
2013	9496717875.519316
2014	9402090137.742302
2015	7797667196.730872
2016	7980917075.774796
2017	9514404016.209494
2018	11252353420.879784
2019	11736797054.696486
2020	11530746234.449179
2021	13691869264.079353
2022	14510490660.251604
2023	16539436547.294973