Year	constant 2010 US$
1991	940.961190503836
1992	945.952780643502
1993	887.43747883273
1994	800.444326980003
1995	802.715591410778
1996	871.349378645844
1997	893.687619610597
1998	914.379309024247
1999	935.403294588368
2000	957.443630962325
2001	948.539454381112
2002	950.912448268498
2003	942.604473733737
2004	906.124462948672
2005	910.234808657244
2006	917.533224330325
2007	942.771934397304
2008	947.863075027519
2009	936.23807194908
2010	877.568660771942
2011	880.163095229236
2012	875.882855680548
2013	884.283082500981
2014	889.795812270789
2015	886.844301586558
2016	876.510609227368
2017	864.258980294606
2018	856.629250533249