Year	constant 2010 US$
1991	3521.01118695336
1992	3493.52610461199
1993	3529.11805478617
1994	3711.00248156824
1995	3615.63989427856
1996	3961.67473156348
1997	3826.22774079588
1998	4192.01098112865
1999	4143.90359125736
2000	3994.62426334696
2001	4087.83247145991
2002	4329.70485884225
2003	4263.97224301304
2004	4160.10973193835
2005	4365.08048696345
2006	4677.23189120141
2007	4479.03969555685
2008	4275.08696100515
2009	4735.63343636514
2010	5086.77086970077
2011	5346.32455360506
2012	5548.66093624451
2013	5770.44583706994
2014	5969.4509872113
2015	6166.60546411316
2016	6069.55954784996
2017	6207.5934540489
2018	4280.62588952347