Year	current US$
2000	34.17421529
2001	34.37180059
2002	30.19883828
2003	26.85229656
2004	40.15632358
2005	56.97205227
2006	65.19192029
2007	89.27136857
2008	115.79461775
2009	107.00795883
2010	125.27296698
2011	132.07857572
2012	161.74359942
2013	174.79058341
2014	173.68992667
2015	136.68732327
2016	132.64790873
2017	143.42549094
2018	146.79824343
2019	150.83859319
2020	132.72055802
2021	152.81578381