Year	current US$
2000	266.89698691
2001	269.84299363
2002	257.53848391
2003	268.45381506
2004	280.13638406
2005	333.39831229
2006	391.68673713
2007	394.80706388
2008	357.94512199
2009	420.03764023
2010	405.73106692
2011	554.21590711
2012	655.40304084
2013	737.06985921
2014	878.43645847
2015	820.54731979
2016	865.67884872
2017	906.10959338
2018	907.6440483
2019	944.23201128
2020	1061.39789615
2021	1110.10437611