Year	constant 2015 US$
1991	6715.120469894854
1992	7025.377515715173
1993	7083.984348959156
1994	7262.2871612871195
1995	7533.361101450225
1996	7731.196423798947
1997	7619.076099450077
1998	7930.63026538192
1999	8689.575174289037
2000	8795.10541576508
2001	9120.92939771754
2002	9608.121521209221
2003	10238.869054877996
2004	10804.037300360067
2005	11425.765540897064
2006	11098.183323770996
2007	10810.123167832418
2008	11277.966704604409
2009	10804.640333449544
2010	10774.588195738292
2011	9563.066713781254
2012	9955.953209192843
2013	10557.11978398504
2014	12793.580290626209
2015	13219.21852661401
2016	13300.893737737353
2017	13629.585165281589
2018	13726.523639047982
2019	13606.79507620666
2020	11721.780905540008
2021	11294.601736635777
2022	12850.635418081243