Year	current US$
1990	54846522533.5532
1991	49011776493.44
1992	43625946923.0795
1993	33663966239.0374
1994	37217152421.3077
1995	41377071172.9025
1996	45624225432.4309
1997	47521988921.5136
1998	52159509142.2965
1999	53408945005.8256
2000	57801759853.3288
2001	56112080782.7791
2002	63973973675.5366
2003	76978838213.4187
2004	93197539595.4593
2005	118713706485.931
2006	149962643251.285
2007	156216965064.628
2008	204846581470.222
2009	195911480719.554
2010	211005429049.345
2011	236217757791.786
2012	254884425341.796
2013	312208555856.761
2014	337373789034.806
2015	289290331214.373
2016	256953777008.125
2017	260414916415.294