Year	constant 2010 US$
1991	3864.24780394554
1993	3716.8821116401
1994	3655.48836460333
1997	3638.62820384886
1998	3627.80749115622
1999	3663.74497880101
2000	3595.25760466586
2001	3679.71679139082
2002	3915.92190569793
2003	3931.78234132003
2004	4189.2319263319
2005	4346.09356876032
2006	4490.85544178011
2007	5179.13932748985
2008	5386.27606607625
2009	5564.66046938023
2010	5840.05499224913
2011	5895.10062911332
2012	5891.23870601458
2013	6099.39011427254
2014	6113.61420260582
2015	6025.80600775674
2016	5900.8662115899
2017	5802.76648528733
2018	6158.85130541491