Year	current US$
2000	186.43986759
2001	185.14412435
2002	197.11457254
2003	216.10307316
2004	205.90194896
2005	216.22939918
2006	259.2555892
2007	311.44023695
2008	286.16907546
2009	274.5735424
2010	271.10289564
2011	287.33162013
2012	264.36074322
2013	280.19290682
2014	269.19130405
2015	255.2692748
2016	244.43634953
2017	257.14948318
2018	252.14672892
2019	242.27598958
2020	237.32375302
2021	250.17954498