Year	current US$
2000	42.99362183
2001	44.56903839
2002	50.15548325
2003	56.79228973
2004	64.54340363
2005	73.29019928
2006	82.79460144
2007	98.87766266
2008	134.2076416
2009	165.29444885
2010	189.34370422
2011	239.7543335
2012	285.31427002
2013	329.78106689
2014	363.00939941
2015	393.77990723
2016	398.78921509
2017	440.58850098
2018	504.79974365
2019	539.6194458
2020	583.43218994
2021	670.5145874