Year	current US$
2000	104.0227356
2001	91.42378998
2002	64.76425171
2003	70.50261688
2004	87.64266968
2005	94.68041992
2006	121.79750824
2007	160.36560059
2008	219.66795349
2009	216.58901978
2010	257.05856323
2011	336.1187439
2012	367.14849854
2013	390.28686523
2014	439.34469604
2015	392.22418213
2016	384.44702148
2017	405.53366089
2018	421.08627319
2019	415.88879395
2020	410.887146
2021	478.70828247