Year	constant 2011 international $
1990	20639.000535974
1991	19553.5855977829
1992	16704.93382574
1993	15274.2205856376
1994	13370.8533518986
1995	12813.3966776832
1996	12370.0959893354
1997	12564.0309592216
1998	11917.8464620528
1999	12719.8928946552
2000	14050.851335184
2001	14829.0829751764
2002	15604.1494910555
2003	16818.7426277435
2004	18098.3670811063
2005	19325.9357374404
2006	20970.1899029814
2007	22798.9708291491
2008	24005.9966846059
2009	22121.8524916504
2010	23325.9811931043
2011	24310.043965548
2012	25156.4209403579
2013	25551.0899736271
2014	25284.5862019817
2015	24516.5499502675
2016	24416.6238783996
2017	24790.6483258882