Year	constant 2015 US$
1997	4711586867.953667
1998	5157329882.2847595
1999	5790138576.437592
2000	6236172102.71097
2001	6768856869.777113
2002	7028071362.676846
2003	7427777954.925622
2004	7815007070.810205
2005	8217508886.298667
2006	8779915752.851791
2007	9292099558.51129
2008	9773358384.81463
2009	9893496773.902622
2010	10319570701.542019
2011	10691786099.278015
2012	10760660629.025997
2013	11132894272.64108
2014	11243215091.293528
2015	11521811393.62025
2016	11951741965.298634
2017	12244490188.346464
2018	12691888499.336927
2019	12808216511.611916
2020	12344914839.970533
2021	13476335493.92849