Year	current US$
2000	38.556238184712655
2001	39.708149332355404
2002	44.27127004553723
2003	50.556070562628484
2004	56.867322484034126
2005	65.31063584667208
2006	74.90199271073121
2007	89.57632929681475
2008	117.05308848835098
2009	139.07967456167003
2010	161.02469612096667
2011	201.14562322283697
2012	234.52350243297485
2013	265.06314014490755
2014	288.73813876075695
2015	308.6512277062107
2016	313.91661692495035
2017	344.2002206369173
2018	390.15299672812944
2019	416.35885754716026
2020	447.99770466508045
2021	515.7247290231008