Year	constant 2010 US$
1991	4224.52906767824
1992	3922.14476910831
1993	3935.716357177
1994	3581.29746718578
1995	3492.96044526592
1996	3520.09140050449
1997	3776.83964389968
1998	3646.32100284373
1999	3483.14752733456
2000	3734.28040499897
2001	4109.41631530973
2002	4524.80288670911
2003	4526.44416988062
2004	5009.65846769599
2005	5135.41957193515
2006	5356.04632533095
2007	5255.90948533042
2008	5625.55679801417
2009	5861.43687949289
2010	5657.7095733721
2011	6158.54374683057
2012	6094.72199078074
2013	6497.68433082738
2014	7067.91430181258
2015	7445.99745673271
2016	7654.90557021077
2017	8040.00246201764
2018	8159.32864375762