Year	constant 2011 international $
1990	20598.0931485188
1991	20359.4561949628
1992	19794.4884051506
1993	19389.1065310188
1994	19225.515679599
1995	19505.7589014149
1996	19764.3263415294
1997	20314.6592599886
1998	20697.73658705
1999	21268.8042093586
2000	22246.1902603585
2001	22763.3672053422
2002	23226.8488170847
2003	23749.266598818
2004	24610.3039298671
2005	25362.1453944672
2006	26456.0917038646
2007	27526.4244451544
2008	27870.1420446377
2009	26465.123962664
2010	27116.1579312351
2011	27806.1981588102
2012	27903.3425320869
2013	28123.9845350922
2014	28512.306628351
2015	28876.4279730804
2016	29282.0768309425
2017	30002.6404202463
2018	30582.291156394