Year	current US$
2000	62.07320558
2001	62.61004619
2002	70.03865368
2003	82.6826019
2004	100.38481287
2005	92.52274702
2006	91.14421736
2007	95.76533714
2008	110.29644509
2009	114.20498852
2010	157.59351817
2011	158.65902799
2012	172.09820166
2013	183.97980584
2014	245.37479121
2015	214.78446037
2016	237.99213061
2017	262.06964432
2018	282.231918
2019	316.05713432
2020	292.49129889
2021	277.91561825