Year	constant 2010 US$
1991	7369.41329600644
1992	6425.13401841888
1993	4926.40867469948
1994	4967.41302740488
1995	5091.77769338964
1996	5139.21697187331
1997	5259.62353946788
1998	5182.5554346017
1999	5409.30040220178
2000	5362.52589295564
2001	5506.18796242862
2002	5358.40261554289
2003	5434.31565457734
2004	5526.73211044039
2005	5061.22100011933
2006	4892.81558143807
2007	4824.48785727924
2008	4941.04522096376
2009	4888.81244302806
2010	4972.85748887057
2011	4818.49015567966
2012	4730.30732966276
2013	4599.04705943156
2014	4495.92522609978
2015	4457.65196465714
2016	4502.04608066932
2017	4525.55340394722
2018	4561.23748578275