Year	current US$
2000	209.84995153748002
2001	208.13541269920492
2002	239.96641767725947
2003	275.105225552513
2004	311.85317840980366
2005	347.86112297666085
2006	364.30794306095754
2007	430.19097954360836
2008	463.0188514660792
2009	434.4742142519001
2010	438.5848746594958
2011	465.5055442606346
2012	459.14446228427437
2013	487.27196048494176
2014	504.5256695175194
2015	474.65968276219974
2016	500.10632711087334
2017	536.4719378670118
2018	581.7204619838101
2019	612.1225422909478
2020	707.4080597985233
2021	848.3511264383029