Year	constant 2010 US$
1991	4925.76406227903
1992	5015.00324043367
1993	5240.46332731871
1994	5271.47833317093
1995	4891.79111689201
1996	4779.78681932808
1997	4887.56639081701
1998	5134.01295732115
1999	5493.23945558703
2000	5680.081089233
2001	5950.4578305442
2002	6437.01645909798
2003	7000.39263579353
2004	7164.00224005668
2005	7388.83241996025
2006	7521.23785490977
2007	7619.14214853883
2008	7539.74255557882
2009	7050.34038104787
2010	6876.99556016291
2011	6945.55306294951
2012	6823.57758117242
2013	6858.34367461981
2014	7067.10451630829
2015	7362.83131114144
2016	7677.16058866639
2017	8067.67149479412
2018	8517.97061987602