Year	current US$
2000	30.72900526
2001	43.59496201
2002	61.20602572
2003	82.32349532
2004	91.61709154
2005	105.95488609
2006	116.13911467
2007	106.41169694
2008	126.17049132
2009	126.78340008
2010	135.54257388
2011	157.78999336
2012	167.04492019
2013	157.69310283
2014	143.39377493
2015	167.27780892
2016	147.46613129
2017	152.91355113
2018	149.9556453
2019	149.84489649
2020	149.6963757
2021	151.3353074