Year	constant 2010 US$
1991	4236.7037407222
1992	3935.52576748413
1993	3622.26047174548
1994	3374.93141581118
1995	3168.45886156293
1996	2942.43204231208
1997	3028.56851341286
1998	3115.16883420011
1999	3196.09232949523
2000	3281.84669153056
2001	3135.21892988304
2002	2995.09809173271
2003	2863.42402035169
2004	2750.38289950117
2005	2673.10006343826
2006	2577.06540498085
2007	2739.80138600598
2008	2904.28090517929
2009	3083.79341319774
2010	3198.30822102106
2011	3319.02637372936
2012	3452.10746858886
2013	3565.18182281454
2014	3663.04642733163
2015	3766.68069989567
2016	3904.1585108288
2017	3720.50602828351
2018	3846.03785785682