Year	current US$
2000	61.67028527
2001	61.0276155
2002	60.63391435
2003	81.6284042
2004	93.40664819
2005	93.21094846
2006	80.40199803
2007	83.98263849
2008	79.68830527
2009	134.49350572
2010	141.39631555
2011	140.25092865
2012	125.38878534
2013	113.92456373
2014	97.35519819
2015	90.31565037
2016	102.86083538
2017	65.47720298
2018	96.02124666
2019	77.71321879
2020	75.10681474
2021	83.20717659