Year	current US$
2000	109.51350705
2001	109.69043112
2002	125.35696711
2003	130.93331997
2004	140.23903907
2005	156.26495385
2006	166.22799335
2007	188.08106585
2008	211.88661492
2009	171.53116988
2010	150.5478983
2011	160.20665331
2012	178.89333852
2013	172.1280189
2014	175.63148692
2015	169.22441198
2016	169.82996859
2017	175.99399451
2018	176.84580934
2019	176.19997404
2020	148.82771161
2021	173.19144043