Year	current US$
2000	39.06169991
2001	38.05131707
2002	40.31638011
2003	48.44182713
2004	53.48508925
2005	53.71531863
2006	54.37385979
2007	59.56182384
2008	64.20702702
2009	61.05199815
2010	58.20672651
2011	54.76969646
2012	53.83768206
2013	57.41566575
2014	57.51682684
2015	48.13482084
2016	47.36023006
2017	50.20273575
2018	53.03470696
2019	51.62925116
2020	58.42785818
2021	59.01136785