Year	current US$
2000	30.31430133
2001	34.28389438
2002	36.09959412
2003	48.01524716
2004	66.10404517
2005	71.34986309
2006	78.11163342
2007	98.60250017
2008	100.39543135
2009	96.93202512
2010	97.37985438
2011	106.56934095
2012	104.58319202
2013	114.07534899
2014	118.95859657
2015	106.96727977
2016	118.63031649
2017	125.45509988
2018	151.43421778
2019	156.9602069
2020	158.14094236
2021	184.4434366