Year	constant 2010 US$
1970	20475345367.9049
1971	21060701715.3932
1972	22538497975.2226
1973	23046909758.4936
1974	23332683507.9546
1975	22800104550.5261
1976	23604889159.5507
1977	24116901179.305
1978	23924780875.0772
1979	25407284220.0717
1980	26243791023.4127
1981	25710553468.7926
1982	26118481883.6875
1983	28158301942.9862
1984	29258487306.8015
1985	30292584825.0601
1986	30813442566.1109
1987	29501752199.2505
1988	29189968128.0922
1989	30269102207.9186
1990	29755325097.905
1991	29482262772.1003
1992	29370366149.1001
1993	28617554708.9966
1994	31787799949.325
1995	33606038681.9166
1996	32395169872.379
1997	35291598885.15
1998	35977112325.1379
1999	36455382974.0891
2000	37777871561.1011
2001	38382501655.8278
2002	37450572760.854
2003	36353792579.2241
2004	36977961887.0659
2005	36334916052.862
2006	38283376733.0628
2007	38744468557.0516
2008	38504368096.0869
2009	33923294586.2208
2010	35206590417.0908
2011	37407004885.2478
2012	38933859701.3731
2013	40018610171.4504
2014	40556074021.0612
2015	40345096749.2432
2016	42805664220.3384
2017	43356956477.2873
2018	44594828660.7131