Year	constant 2011 international $
1990	31005.636485491
1991	29164.3983210033
1992	27519.3026804507
1993	27090.7660552441
1994	27459.9103809806
1995	28218.5422989711
1996	29017.4330110787
1997	29267.4906697163
1998	30306.2847016489
1999	32088.7824995024
2000	32972.9406359751
2001	33328.0245285838
2002	33668.4424988705
2003	32662.026721545
2004	32354.6996224201
2005	32838.9943043302
2006	33037.6167730227
2007	32884.1288424016
2008	31531.871633751
2009	29703.4249165462
2010	29706.9085147558
2011	29503.7080684624
2012	30079.2030572058
2013	29663.3453617057
2014	29342.5386195132
2015	29366.0597007094
2016	28585.3551325056
2017	28705.2784998865