Year	constant 2010 US$
1991	18258.0796951449
1992	18148.3691877099
1993	18058.8178951283
1994	17762.3599061663
1995	17590.6382724218
1996	17635.6081084509
1997	17743.4543590785
1998	17553.2282655729
1999	17518.5953694149
2000	17635.2361176588
2001	17226.9288784161
2002	16986.4350337213
2003	16734.6847517159
2004	17051.4836467293
2005	17325.6402950143
2006	17583.7052948882
2007	18103.123008297
2008	18400.6650216594
2009	18072.2855615278
2010	18829.0704628207
2011	19032.7125694965
2012	18989.6884455238
2013	19168.9657270948
2014	19180.561856797
2015	18877.9636930718
2016	18809.9903439066
2017	18755.1421278394
2018	18756.0829443273