Year	constant 2010 US$
1981	38848782957.0757
1982	33166022470.6787
1983	23538054780.3778
1984	21840059071.403
1985	22979126677.9021
1986	20875253260.3504
1987	24489438774.9489
1988	28195954487.9545
1989	23744072712.5457
1990	25453492552.6022
1991	27714220792.0265
1992	31056679201.3201
1993	25618508582.2832
1994	22385982874.0236
1995	19284849128.3983
1996	19898393071.0988
1997	20305731180.0556
1998	19349650689.9626
1999	19798102664.7061
2000	19831612688.7916
2001	20296378195.984
2002	23895208729.3244
2003	21312605847.7159
2004	21086182959.1877
2005	21571789434.3238
2006	21747129598.5309
2007	21767784534.059
2008	22420208776.5639
2009	23229141724.4408
2010	23810308307.4958
2011	28052211612.2636
2012	31827831563.2943
2013	38765375781.4475
2014	44473098372.5665
2015	43823727766.1712
2016	41931578908.5683
2017	41842850849.6454
2018	42719066665.419