Year	constant 2011 international $
1990	20166.9279938074
1991	21096.4284610415
1992	21342.8565638582
1993	20881.2060699675
1994	21026.0209145347
1995	21850.740004652
1996	22529.9200028742
1997	23422.3365254069
1998	24420.9481126354
1999	25227.3885769824
2000	25999.490687324
2001	26318.4780060543
2002	26375.9645090982
2003	26031.6495899131
2004	26439.9333354366
2005	26593.2857037278
2006	26957.6363702978
2007	27575.2364597729
2008	27590.3747959133
2009	26743.1979904258
2010	27238.4606724422
2011	26780.2149060404
2012	25805.8498346706
2013	25654.6142954091
2014	26023.6978492184
2015	26607.8328143368
2016	27205.9178026354
2017	28034.619961314
2018	28687.4842278729