Year	constant 2010 US$
1991	1651.51733222594
1992	1639.3141496875
1993	1647.71262687149
1994	1670.8335985886
1995	1659.07322788573
1996	1686.16755473069
1997	1726.35991323477
1998	1785.31337283148
1999	1829.4218484067
2000	1822.32341959097
2001	1875.95605937128
2002	2811.65887780149
2003	2972.61018474326
2004	3240.39710070404
2005	3424.48890164303
2006	3680.29883061432
2007	3914.14783758101
2008	4113.12691227809
2009	4374.11728984493
2010	4538.12343131784
2011	4613.96026476078
2012	4899.52933718189
2013	5044.11570761062
2014	5237.46386170683
2015	5418.4451237971
2016	5565.17478961058
2017	5598.96521843858
2018	5588.88891163833