Year	current US$
1999	26642620500.62247
2000	23565027685.8471
2001	23804827190.651775
2002	25029778639.15854
2003	28366039396.878414
2004	34632687534.62038
2005	40025389270.53529
2006	44380175641.92375
2007	50815925715.28246
2008	55276962850.925224
2009	51385362875.50073
2010	55483841050.51242
2011	61711276949.83585
2012	58705844008.520004
2013	60171136722.29499
2014	61866617450.76395
2015	56461965476.46327
2016	59681114180.869736
2017	66071821778.86891
2018	69462494172.31352
2019	69915268103.15935