Year	current US$
2000	42.70728091
2001	41.32051305
2002	51.49590822
2003	77.98264561
2004	109.04250498
2005	126.90751273
2006	148.46669266
2007	199.47759128
2008	231.8841404
2009	214.10419858
2010	221.06424754
2011	239.64152765
2012	239.30639918
2013	282.50331459
2014	303.27644026
2015	274.77634395
2016	291.67984722
2017	336.089663
2018	383.15058757
2019	384.82567174
2020	385.96673559
2021	466.09377431