Year	constant 2015 US$
1990	42200864237.73687
1991	38402786455.31467
1992	33986466014.244892
1993	31675386324.39277
1994	28191093830.06132
1995	29600648521.98681
1996	30192661492.37827
1997	30554973429.890938
1998	26918931591.303043
1999	27726499539.28352
2000	35462192911.24691
2001	34823873438.69964
2002	40604636429.57688
2003	43649984162.06671
2004	48538782388.04439
2005	48732937517.50484
2006	52046777268.69517
2007	56783034000.26711
2008	57294081305.784325
2009	50476085631.19377
2010	52040844285.71733
2011	52249007662.24707
2012	54756960030.31493
2013	56235397951.420685
2014	54829513001.85067
2015	52581502969.22135
2016	50215335336.05899
2017	54232562162.84715
2018	59438888129.42803
2019	60627665892.11315
2020	53776739645.732285
2021	55013604657.67826
2022	60624992332.25453