Year	constant 2010 US$
1997	5095.28995379838
1998	4744.8455069744
1999	4902.06639427882
2000	4491.30093393882
2001	4087.05129737708
2002	3729.34744720467
2003	3297.57237833729
2004	3203.72015566109
2005	2849.56087096881
2006	2897.68320974195
2007	3157.5971032011
2008	3266.09764732308
2009	3340.20873266622
2010	3392.64016570691
2011	3478.41070276061
2012	3597.1648384072
2013	3645.31619447282
2014	3746.18403764397
2015	3691.66275431867
2016	3738.42765580465
2017	3392.5217640337
2018	3320.40896502669