Year	constant 2011 international $
1990	23758.7280977593
1991	24301.6921936592
1992	24407.675543355
1993	24030.9776596201
1994	24486.8229291387
1995	25051.2336818993
1996	25614.3894951727
1997	26448.3786561369
1998	27473.3069596232
1999	28589.3085949046
2000	29967.1314474464
2001	30950.5732327814
2002	31395.2760183926
2003	31815.4213391699
2004	32261.4444925784
2005	32901.9877322306
2006	33700.8521141386
2007	34329.6470032958
2008	34163.9463911854
2009	32652.5121822546
2010	32507.0939660629
2011	32068.2709273108
2012	31109.1874649142
2013	30678.9172969914
2014	31195.4052422035
2015	32357.4740440962
2016	33356.2233860542
2017	34269.1162384896
2018	35055.6630250429