Year	current US$
2000	159.24748813
2001	167.47007762
2002	190.67919057
2003	278.84142383
2004	348.77124581
2005	405.13700618
2006	466.19993419
2007	647.86504283
2008	818.62908105
2009	768.42249577
2010	709.1854657
2011	786.46956597
2012	795.68408718
2013	889.54266561
2014	959.61215815
2015	860.56231806
2016	912.33091325
2017	992.23492391
2018	1143.16683814
2019	1189.42264281
2020	1377.96336326
2021	1595.23214717