Year	current US$
2000	52.41205766
2001	55.82246722
2002	58.89033492
2003	60.2452122
2004	60.35195018
2005	59.78591929
2006	58.91585356
2007	60.7862995
2008	62.18460913
2009	58.91704387
2010	59.75211149
2011	60.42922444
2012	62.17840073
2013	66.50602
2014	67.84838015
2015	67.62557327
2016	67.29335231
2017	66.33750269
2018	67.29455068
2019	68.96304597
2020	59.56815039
2021	70.58541823