Year	constant 2015 US$
1988	13590690651.830927
1989	7821290496.882604
1990	9896526025.778543
1991	14790098775.878973
1992	17221346342.705746
1993	19075339624.591713
1994	20621442059.165245
1995	21951290517.48259
1996	24428699054.154694
1997	24686413686.457115
1998	25591349424.6391
1999	25456845224.229546
2000	25798443405.565468
2001	26789018310.960865
2002	27706046545.312695
2003	28600147893.72675
2004	30510478932.499874
2005	31329923063.100735
2006	31815384920.712646
2007	34777595316.00503
2008	37931620043.70151
2009	41812842419.74392
2010	45147473283.5593
2011	45539055323.50657
2012	46707037069.3046
2013	48494923363.26254
2014	49699566407.48328
2015	49929337836.81592
2016	50705514062.86077
2017	51163399287.703354
2018	50199119756.20081
2019	46727888410.6848
2020	36728167162.87392
2021	34156740537.16038
2022	33944395264.176895
2023	33893439565.644905