Year	current US$
2000	63.04348302
2001	66.10757608
2002	69.24484138
2003	72.40227667
2004	75.71725171
2005	78.73661945
2006	78.23447629
2007	79.09049779
2008	92.62548708
2009	75.8181683
2010	69.9017438
2011	70.71988261
2012	74.01732838
2013	71.01911607
2014	64.09423962
2015	89.05869034
2016	92.02165281
2017	98.44896624
2018	102.25494927
2019	105.92397544
2020	106.78934197
2021	112.01424515