Year	constant 2010 US$
1991	4784.05266384434
1992	5395.2235816545
1993	5261.89365113514
1994	5478.23661698716
1995	5946.18569303938
1996	6215.46835584574
1997	5563.08265438583
1998	5980.05235515391
1999	6753.99212697464
2000	5779.76461860089
2001	5765.35607295951
2002	6580.66100848312
2003	4468.83314898461
2004	5353.40017346522
2005	6894.54957994387
2006	7153.58258546318
2007	5126.85673751737
2008	4356.73453763894
2009	4551.20650663249
2010	5056.96070857531
2011	5617.73294339136
2012	5082.91692173044
2013	5541.42185906093
2014	5207.43609421197
2015	3257.68165303726
2016	3220.31654671211
2017	3006.34121938456
2018	2969.40173134916