Year	constant 2010 US$
1990	2396.08005301298
1991	2280.88113447938
1992	2233.52077454857
1993	2236.02468536863
1994	2154.4528876771
1995	2152.68295567763
1996	2144.07091483927
1997	2247.48324254402
1998	2245.22452155209
1999	2215.22578195142
2000	2339.63177668556
2001	2405.53312384519
2002	2564.97076056627
2003	2770.49124684469
2004	3077.74665205541
2005	3381.24591693651
2006	3696.89723732253
2007	4101.25282646357
2008	4379.5414036896
2009	4149.53326472186
2010	4372.71454529792
2011	4711.40141505383
2012	4955.26599000974
2013	5206.55840178878
2014	5271.89928289302
2015	5068.00919096863
2016	5093.74340554404
2017	5311.94154341613
2018	5424.88132172537