Year	constant 2015 US$
1998	16883716306.274384
1999	16695795758.806545
2000	17159858401.319872
2001	18131699762.038265
2002	18612569943.86933
2003	20104443313.944256
2004	21854325176.924313
2005	23269568793.956676
2006	24516487357.835804
2007	27880533260.6051
2008	29193758035.205154
2009	32302357529.41179
2010	34190802469.590385
2011	37320841002.62602
2012	42604628360.66304
2013	45336307543.29653
2014	47670219038.97478
2015	47778933680.10403
2016	47137133598.70807
2017	49937878553.35308
2018	50725995751.75123
2019	50014362500.87695
2020	50100785268.792435
2021	52480152786.01879