Year	current US$
2001	533.50253682
2002	557.95952253
2003	579.86528439
2004	659.02228273
2005	647.05488852
2006	660.79144596
2007	735.41724298
2008	834.42706051
2009	786.97442242
2010	507.47437709
2011	506.56372112
2012	493.50406568
2013	454.60671892
2014	498.41297035
2015	484.89775462
2016	452.12214993
2017	459.15643754
2018	445.90022511
2019	432.46170208
2020	394.09601173
2021	489.87444129