Year	constant 2015 US$
1991	6485.522018187127
1992	8070.694629530983
1993	7941.981798388438
1994	8264.152500225751
1995	9160.23267707039
1996	9853.40455968414
1997	10452.487358021015
1998	9220.921299285757
1999	10093.244500035544
2000	9949.040802043384
2001	10323.739920391556
2002	10469.292093471557
2003	10529.83679878769
2004	12135.740948671299
2005	12830.139568225928
2006	13479.52905474132
2007	14570.06221246984
2008	15764.691615695496
2009	16882.91401960669
2010	17075.82661850626
2011	17187.17023689091
2012	17421.45655667055
2013	18359.86695899152
2014	20168.22930581651
2015	20947.540317179824
2016	20774.429971124922
2017	21078.93878883562
2018	20719.224959197192
2019	20692.3412649159
2020	18839.785436907216
2021	19724.823683935585
2022	18697.435909273736