Year	current US$
2000	31.98698254215979
2001	32.32625202379948
2002	32.267001487388214
2003	36.718004333591715
2004	43.23584862392369
2005	52.15153613312853
2006	62.57060606354525
2007	77.76350035849097
2008	98.60774361391678
2009	103.14555008042255
2010	119.00895303097727
2011	140.1475555072778
2012	151.2260541314823
2013	163.91246510109335
2014	169.98842148570264
2015	163.90651303204325
2016	159.99589876568575
2017	174.55827926735205
2018	183.94503982840908
2019	189.09496408691632
2020	199.7502011299344
2021	227.88933818087