Year	current US$
2000	205.16979236
2001	197.88182757
2002	66.78065926
2003	73.72731823
2004	85.71262422
2005	129.2317517
2006	147.02831589
2007	178.10928962
2008	224.81716045
2009	204.72496863
2010	262.48148025
2011	323.40505894
2012	355.30899406
2013	379.52280039
2014	346.30523591
2015	395.48247664
2016	339.83602867
2017	318.19946999
2018	305.63911607
2019	243.30089475
2020	194.7417027
2021	233.67674465