Year	current US$
2000	33.75718976
2001	36.25137561
2002	40.17376605
2003	53.05628599
2004	66.77331343
2005	75.02516105
2006	81.81969017
2007	105.04074986
2008	135.20478272
2009	135.39268133
2010	153.14910657
2011	164.47357818
2012	152.72008081
2013	160.53689096
2014	174.67263382
2015	146.4313766
2016	156.58622459
2017	170.36908618
2018	198.38839314
2019	208.35426046
2020	236.05599971
2021	277.76943773