Year	constant 2010 US$
1991	5609.47821997001
1992	5475.5671680162
1993	5094.01589750873
1994	4622.44718934496
1995	4631.43626616627
1996	4698.78523109322
1997	3974.0923836629
1998	3774.10454419064
1999	3455.08882419602
2000	3952.69471882305
2001	4182.40905295205
2002	4309.53319828258
2003	4302.75882978922
2004	4378.37200387959
2005	4451.09681946282
2006	4451.48026750132
2007	4380.46314701687
2008	4435.41725603965
2009	4416.19948126461
2010	4473.59356540512
2011	4520.77795668393
2012	4703.10550977054
2013	4899.68638412111
2014	5032.88916750446
2015	4861.92934737524
2016	4374.43565953583
2017	3829.03810230477
2018	3556.94232287915