Year	current US$
2000	52.23210881
2001	58.00853136
2002	62.17996766
2003	73.68775486
2004	78.13616455
2005	79.03670305
2006	107.66706485
2007	121.58176542
2008	139.59130431
2009	136.01881973
2010	151.22537812
2011	182.73689931
2012	200.51314619
2013	206.022876
2014	227.50918242
2015	197.23848328
2016	180.47786231
2017	191.82856802
2018	213.39262372
2019	223.71067389
2020	221.17491506
2021	273.76355675