Year	constant 2011 international $
1990	16162.3291597682
1991	16716.8629401927
1992	17321.4200182669
1993	17917.6988593757
1994	18754.0243772589
1995	19804.9459108123
1996	20418.5514065347
1997	21329.9149996808
1998	22277.9374375718
1999	23191.5485154856
2000	24602.3968280154
2001	24566.8485114256
2002	25111.7237767455
2003	25581.6942769111
2004	25523.1291712405
2005	26320.5230203597
2006	26704.3794934398
2007	27672.2589896922
2008	28412.8422114976
2009	27505.0926980917
2010	28339.9675248006
2011	28597.4670967963
2012	29101.8619653828
2013	29998.9172746172
2014	31914.8989151177
2015	34484.530787426
2016	35626.9793041753
2017	36988.9486472307
2018	38146.7968114301