Year	constant 2011 international $
1990	8316.75471924606
1991	7713.44219358595
1992	6372.93651603837
1993	6289.59880030189
1994	5069.65489390459
1995	4600.94948214507
1996	4818.17577388864
1997	4202.47527470254
1998	4441.33264263799
1999	5113.14893740206
2000	5333.08687970853
2001	5506.28501578289
2002	5465.45482822915
2003	5588.66345168
2004	5808.65968997726
2005	6494.99742555022
2006	7124.6049208503
2007	7815.00209999068
2008	8844.62454916563
2009	9248.87916141183
2010	9942.42109273425
2011	11212.4865037223
2012	12235.2269354044
2013	13235.797934289
2014	14332.1376613479
2015	14992.315055462
2016	15648.8484484767
2017	16390.178979035
2018	17128.985335654