Year	current US$
2000	75.03528595
2001	62.10351181
2002	70.07132721
2003	86.89743042
2004	111.04244995
2005	121.23509216
2006	127.42844391
2007	141.43360901
2008	135.50376892
2009	121.84300232
2010	128.39637756
2011	141.65603638
2012	154.21617126
2013	159.02124023
2014	178.70599365
2015	169.72981262
2016	176.06861877
2017	185.6439209
2018	249.3664856
2019	253.74330139
2020	231.98277283
2021	250.02554321