Year	constant 2010 US$
1991	4280.78224759125
1992	4502.91938566959
1993	5252.36793458841
1994	6172.60826878896
1995	6024.93370004824
1996	6195.90345995367
1997	6032.33973710579
1998	6267.02801149409
1999	7681.63881222183
2000	7647.74193093779
2001	8186.00626180349
2002	8417.27977993333
2003	8563.40109723346
2004	9156.68601199665
2005	10102.1918231136
2006	10646.1004855815
2007	11601.5170961402
2008	11850.2553180181
2009	13428.1859633743
2010	13357.704033533
2011	13762.3025176093
2012	13288.6989746832
2013	13737.3169042223
2014	14182.8285957379
2015	13759.2948964731
2016	13627.9656794033
2017	13780.4580216968
2018	14174.449551861