Year	current US$
2000	242.69717208
2001	242.03916123
2002	249.56746835
2003	288.14241012
2004	315.20625042
2005	336.50282744
2006	363.26611259
2007	384.17404067
2008	403.03090434
2009	423.39248812
2010	425.36766429
2011	492.09765192
2012	501.21742594
2013	505.15437238
2014	514.47226827
2015	514.49884031
2016	533.99310432
2017	540.36084696
2018	538.61723857
2019	547.43872551
2020	531.68296913
2021	545.01936449