Year	current US$
2000	62.11769485
2001	67.33850098
2002	66.94760132
2003	76.23547363
2004	93.02433014
2005	101.30373383
2006	117.43313599
2007	151.77920532
2008	207.84881592
2009	208.93501282
2010	230.06391907
2011	288.31332397
2012	336.67266846
2013	333.16027832
2014	361.15942383
2015	292.275177
2016	261.40023804
2017	265.83843994
2018	266.46469116
2019	235.99041748
2020	206.03512573
2021	204.56661987