Year	current US$
2000	9.44797232
2001	10.21417309
2002	12.73238727
2003	16.11409638
2004	19.52050867
2005	24.008209
2006	29.09393969
2007	38.588089
2008	59.75246245
2009	81.65267377
2010	98.28117352
2011	128.80104871
2012	159.02065426
2013	188.14107447
2014	212.05372589
2015	236.98070967
2016	231.70224724
2017	249.69626627
2018	284.78994813
2019	302.07379755
2020	319.27696917
2021	362.53545416