Year	constant 2010 US$
1990	6597.46457664895
1991	6266.55987310498
1992	5574.38040949724
1993	5265.2550991564
1994	4711.18993558866
1995	4636.71546761326
1996	4655.89023083837
1997	4785.63253228701
1998	4708.34695468058
1999	4812.3751535196
2000	5190.66231243829
2001	5345.98654881418
2002	5617.26687001727
2003	5923.86672171967
2004	6388.62239223568
2005	6802.3194908064
2006	7287.95844461788
2007	7825.17883778777
2008	8133.35093020929
2009	7698.14153134052
2010	8019.19050389151
2011	8417.31357780264
2012	8657.86581980358
2013	8918.10606357552
2014	9084.20055184141
2015	9179.22124653912
2016	9286.66239120376
2017	9606.96167458431
2018	9854.09292353304