Year	constant 2011 international $
1990	20898.1474559818
1991	19781.5178135449
1992	16755.8576989789
1993	15337.9891122844
1994	13507.410623731
1995	12896.9950129694
1996	12363.0408659286
1997	12470.7142331589
1998	11592.4685352754
1999	12416.8232783874
2000	13855.3552607009
2001	14823.1541134225
2002	15515.9260263503
2003	16532.2398063826
2004	17937.9371935722
2005	19086.1752706283
2006	20592.3273414552
2007	22542.0739207489
2008	23557.2214648728
2009	21687.9343062178
2010	22646.9099488448
2011	23594.3737056694
2012	24387.9137802682
2013	24675.2981458677
2014	24464.9451823402
2015	24032.3413970816
2016	24095.6805815778
2017	24471.8508733977
2018	25036.0202356911