Year	current US$
2000	302.09097778
2001	314.42215292
2002	336.01061429
2003	364.84381513
2004	371.62164834
2005	403.13139979
2006	411.10957517
2007	442.15654558
2008	483.72830589
2009	556.68239184
2010	564.88535946
2011	599.51836755
2012	673.64179821
2013	724.30677012
2014	730.15175264
2015	737.61330997
2016	682.03739405
2017	625.00399658
2018	617.18744003
2019	596.94808022
2020	695.92062871
2021	755.81949025