Year	current US$
1992	4700000000
1993	9233333333.333334
1994	8879831932.77311
1995	8254775604.142693
1996	8854769230.769232
1997	8062904468.412944
1998	8805050942.98721
1999	7118263136.782992
2000	7248577643.908969
2001	7119388489.208632
2002	8682688227.279833
2003	10183739829.471498
2004	12433133048.799683
2005	15705583567.800467
2006	19026327078.74809
2007	23457839409.528072
2008	31565109530.050552
2009	28595513864.771484
2010	31846728733.494267
2011	30081694517.984253
2012	31563134978.229317
2013	38712676167.36392
2014	41634960534.42357
2015	29851833386.80986
2016	26014255391.76191
2017	29801142861.874348
2018	32148479982.410748
2019	34757907488.491875
2020	32057632989.352654
2021	35444080081.14469
2022	39418719774.570656
2023	39337290305.41839