Year	current US$
2000	115.37317079
2001	129.91026847
2002	126.86774474
2003	142.12920565
2004	144.91366501
2005	173.07414966
2006	200.9130664
2007	231.44676582
2008	220.5583561
2009	153.40751387
2010	177.95152057
2011	184.01892997
2012	201.70175879
2013	196.84283083
2014	208.42443591
2015	184.632458
2016	223.59975487
2017	208.68883727
2018	201.07239926
2019	194.49540733
2020	192.35849285
2021	176.90309908