Year	current US$
2000	62.85141754
2001	60.46850204
2002	65.32598114
2003	68.42656708
2004	74.88806915
2005	85.49252319
2006	98.42082214
2007	125.84896088
2008	138.78439331
2009	150.38439941
2010	162.99217224
2011	186.59481812
2012	202.51856995
2013	212.02635193
2014	216.9332428
2015	228.02095032
2016	237.30305481
2017	268.69104004
2018	298.95074463
2019	317.6022644
2020	377.86999512
2021	470.56878662