Year	current US$
1990	2193024878.031038
1998	3522382329.235468
1999	3544289326.3986893
2000	3141818060.3162026
2001	3226747090.0954823
2002	3572612216.8967996
2003	4484507606.061341
2004	5187094187.081182
2005	5560440169.195952
2006	6027279517.547156
2007	7041119566.642482
2008	8116073135.376879
2009	7941532320.299899
2010	7990192613.789207
2011	8798506260.711592
2012	8434297303.012581
2013	8941547289.015572
2014	9165511773.61903
2015	7793247760.453209
2016	7875040108.781248
2017	8175990100.3736725