Year	current US$
2000	138.36383057
2001	163.64501953
2002	173.12641907
2003	175.18499756
2004	176.04594421
2005	180.72239685
2006	195.48561096
2007	232.77416992
2008	256.6998291
2009	242.08943176
2010	242.6184082
2011	251.19102478
2012	246.298172
2013	261.2244873
2014	296.24938965
2015	285.84985352
2016	292.99127197
2017	281.6338501
2018	287.60293579
2019	298.96051025
2020	279.65802002
2021	310.19500732