Year	constant 2015 US$
1995	1639.3929418459904
1996	1462.6716804877935
1997	1494.6856415247219
1998	1249.6935624649761
1999	1241.3155254053206
2000	1221.4234966286967
2001	1282.9561746398863
2002	1709.7293846918803
2003	1580.9752526032885
2004	1933.2476520267223
2005	2078.338730835741
2006	2386.068020073275
2007	2968.042646178358
2008	3107.4370729742845
2009	3462.8958079850318
2010	3712.4900425483384
2011	3855.577732803819
2012	4188.685118061511
2013	4392.429283563995
2014	4696.656210371641
2015	4992.828992130841
2016	5316.536215160844
2017	5632.7926186120585
2018	5830.6737910603715
2019	6046.2104285787445
2020	5996.367946234004
2021	6375.389141479814