Year	constant 2010 US$
1991	17656.1587550271
1992	17267.610604767
1993	17282.9639718282
1994	17419.6551871367
1995	17605.4546162013
1996	17526.0300147207
1997	16768.6182441072
1998	16801.5440142916
1999	17129.9161655881
2000	16885.0473180138
2001	15914.3486656395
2002	15967.6070594961
2003	15932.4561486275
2004	16246.6317443381
2005	16256.0333004341
2006	16166.1440077473
2007	16542.4315652921
2008	16481.7304843417
2009	15260.4298894918
2010	15763.4740904194
2011	14817.6724865765
2012	14885.478058583
2013	15193.0338313462
2014	15389.7786466394
2015	15633.4243764111
2016	15567.798752577
2017	15623.8531840702
2018	15892.092776571