Year	current US$
2000	148.40265931
2001	136.03820778
2002	138.23218218
2003	142.44581873
2004	199.73509934
2005	344.90903904
2006	398.68263617
2007	222.49466584
2008	245.9881449
2009	226.56512977
2010	252.85213094
2011	204.4495625
2012	212.04850342
2013	214.61099265
2014	232.37283933
2015	297.12367055
2016	330.75596433
2017	329.97026734
2018	342.50364218
2019	377.89503359
2020	328.18975664
2021	391.67657551