Year	current US$
2000	87.03218835
2001	68.90273161
2002	62.44813335
2003	114.30096141
2004	143.90623265
2005	161.7696585
2006	198.31568263
2007	219.85694527
2008	211.62208304
2009	245.18538129
2010	322.40911892
2011	360.01046513
2012	338.42420577
2013	308.29153251
2014	304.39313162
2015	285.01475274
2016	262.24861336
2017	307.21369591
2018	325.83864567
2019	321.72556479
2020	304.12027274
2021	352.44622671