Year current international $ 2000 63.58472787415535 2001 67.96618481588833 2002 71.97431975693533 2003 78.40354737262818 2004 84.73300901361729 2005 92.33929126728344 2006 104.18827765959979 2007 116.70207241953858 2008 131.29720993390444 2009 152.60433269827104 2010 158.22823149951387 2011 172.3409983228689 2012 186.38061117693516 2013 200.51875664752103 2014 214.74153852460927 2015 227.57566073463906 2016 232.88262839917448 2017 241.25969918195338 2018 253.2029874496934 2019 268.20567880897084 2020 288.8573810810501 2021 311.198789487121