Year	current US$
2000	166.30493975
2001	112.09613489
2002	230.31756568
2003	236.92673853
2004	277.13976889
2005	295.03384024
2006	313.23815242
2007	325.38115303
2008	332.28889964
2009	206.851608
2010	237.81758341
2011	253.39605713
2012	247.85605267
2013	274.75910191
2014	294.94549469
2015	256.04653758
2016	255.7700434
2017	197.07831783
2018	243.12189785
2019	253.78173296
2020	245.71424379
2021	245.45161222