Year	constant 2015 US$
1998	42765779154.49444
1999	42650562147.39995
2000	45345215866.3
2001	47406426578.39697
2002	46698700945.42637
2003	46117615126.82723
2004	46966296235.76593
2005	47500593250.27028
2006	50467928997.002396
2007	52589911904.39411
2008	55055426688.66371
2009	58003725193.95633
2010	58489261773.919174
2011	60507667660.519966
2012	65896758961.07736
2013	70778432455.70386
2014	70938554813.92824
2015	76448114434.33029
2016	80543524314.90053
2017	79938693618.32906
2018	79283621465.81328
2019	77467913048.48021
2020	74926517906.54785
2021	77214066944.1159