Year	constant 2010 US$
1990	37798402081.3096
1991	33658160864.6393
1992	30513992732.9355
1993	28424050903.884
1994	27174758474.987
1995	28859342408.5591
1996	30010671008.8385
1997	28761801833.0644
1998	28614823291.3235
1999	31078462593.2348
2000	31322270486.9454
2001	31291618054.4642
2002	32716918994.8236
2003	33584025325.3984
2004	34811658146.9664
2005	36897772439.7654
2006	38249321047.7023
2007	40163926867.4505
2008	41157670902.8459
2009	41611067916.9319
2010	43241062439.5999
2011	45638118119.7805
2012	48294619947.7869
2013	50815696124.6372
2014	53219118367.8783
2015	56850506431.6709
2016	60430550982.0853
2017	63892798762.3998
2018	65386855894.09