Year	constant 2010 US$
1990	11226863018.7214
1991	10526581131.9266
1992	9949612821.47187
1993	9462358123.93922
1994	8139179721.65047
1995	7190525445.10343
1996	7573972655.67485
1997	8397348290.70901
1998	9509787574.39105
1999	10374739981.5118
2000	11176511288.9152
2001	13110754511.2628
2002	14558211731.0596
2003	15605317650.4706
2004	17072340858.3703
2005	19572064234.5555
2006	22058566640.8018
2007	25007597324.0888
2008	29091654246.463
2009	29091712283.7404
2010	31841490433.0312
2011	32544480370.3258
2012	36022490202.4685
2013	39859577291.6242
2014	41566134114.6639
2015	40601870140.2797
2016	39306914887.3488
2017	41147072314.9204
2018	44512280350.2825