Year	constant 2010 US$
1991	16371.7641051458
1992	15304.4146297887
1993	13641.7920108532
1994	13216.1141486258
1995	12506.0344275422
1996	12643.5884356921
1997	12621.8025818032
1998	12579.6394180718
1999	12629.4979512107
2000	13074.3827987291
2001	12992.8832321969
2002	13407.8207993278
2003	14005.1863583205
2004	14483.7738303337
2005	15257.2151726968
2006	16200.1550999265
2007	17370.5924838994
2008	17893.5733568858
2009	17024.2944744239
2010	17346.8613917075
2011	18026.987821316
2012	18727.740204263
2013	19290.6498427345
2014	19520.8874844189
2015	19339.1603726569
2016	19278.0185302719
2017	19807.8265373079
2018	20417.6450016514