Year	current US$
2000	131.77268877047985
2001	126.80920525673409
2002	106.43023022043833
2003	110.74142714109837
2004	126.97585687221246
2005	149.98522127973743
2006	178.50863075956818
2007	214.29398549510069
2008	254.5712741262105
2009	259.92055487483447
2010	317.216969104751
2011	363.9747840658395
2012	366.18274212635464
2013	391.1080224036936
2014	389.64478854995895
2015	352.25438671623357
2016	332.57517393533703
2017	371.1287032815168
2018	333.2798910085979
2019	321.68509766580763
2020	312.40435528223765
2021	348.94747593605894