Year	current US$
2000	42.95851135
2001	44.91654968
2002	43.48994827
2003	46.37623215
2004	46.29327393
2005	51.6701889
2006	55.93380737
2007	63.45651245
2008	77.74305725
2009	89.26693726
2010	99.99167633
2011	119.23861694
2012	134.63066101
2013	159.08921814
2014	178.20880127
2015	194.92401123
2016	205.92243958
2017	212.87913513
2018	229.22540283
2019	239.17544556
2020	246.19775391
2021	272.95922852