Year	constant 2015 US$
1995	8187.008901679199
1996	8108.5932322336475
1997	6724.457907309018
1998	5706.071672975086
1999	6525.718935096549
2000	6130.470497769561
2001	5630.262427456572
2002	6064.100761772405
2003	5848.585921960082
2004	6583.776283920992
2005	6381.369719334037
2006	6602.568392068114
2007	6334.91021890498
2008	6761.767536330508
2009	6718.122872786045
2010	7010.622537343227
2011	8044.062677067525
2012	7876.760213418838
2013	8805.242631717112
2014	10240.067684280584
2015	12232.876902356327
2016	12998.257862553592
2017	13886.208565482395
2018	14194.85900738229
2019	15984.209163492003
2020	16169.196356658556
2021	17234.4118613628
2022	16373.22294850279