Year	current US$
2000	80.95653534
2001	94.31704712
2002	105.70446014
2003	116.90391541
2004	142.1769104
2005	173.79692078
2006	197.78089905
2007	245.00897217
2008	297.50875854
2009	364.43450928
2010	436.1362915
2011	518.84020996
2012	513.45483398
2013	408.33044434
2014	375.28466797
2015	384.25985718
2016	447.13925171
2017	466.99432373
2018	478.39190674
2019	378.47418213
2020	338.24972534
2021	392.54144287