Year	constant 2010 US$
1991	3320.38374758218
1992	3253.08373709603
1993	3365.99684384893
1994	3534.40205073082
1995	3662.03578472733
1996	3650.329616363
1997	3686.02166631921
1998	3641.19402299477
1999	3659.65343598535
2000	3625.90883374279
2001	3580.25050497396
2002	3666.14905458065
2003	3439.746762823
2004	3428.15255454056
2005	3421.34560738955
2006	3281.07959852475
2007	3369.82305213566
2008	3332.5037195479
2009	3416.39924843464
2010	3479.75129480293
2011	3645.85628677354
2012	3767.239986468
2013	3973.92914825168
2014	3905.92622021983
2015	4056.54156034905
2016	4200.30353911463
2017	4357.83789644468
2018	4697.44655385992