Year current international $ 2000 34.73267221518174 2001 38.14761574634125 2002 45.16327112799717 2003 54.66138183475099 2004 61.396146840576876 2005 70.93326746491333 2006 83.32151249015678 2007 99.2253902401096 2008 123.03792484253086 2009 156.4671327619319 2010 170.59345152903123 2011 197.6980335588866 2012 233.97234814670304 2013 260.1315482017514 2014 285.55365754863567 2015 312.4693311549159 2016 320.47048265514434 2017 334.71612896546173 2018 367.50436128463946 2019 405.3597885279665 2020 436.22429467371757 2021 473.55904501996065