Year current international $ 2000 2.616959591336325 2001 3.140614626895319 2002 3.261688979913251 2003 4.116863232733147 2004 5.59566511259883 2005 6.021100327655472 2006 5.446870476738139 2007 5.7329933747137405 2008 6.333689048833134 2009 6.068040823852013 2010 6.058692339019242 2011 6.366373794090406 2012 6.574037481534785 2013 6.589125537518491 2014 6.735475805137011 2015 5.6366772087161126 2016 5.722142870787088 2017 5.719356912862057 2018 5.5606649690579415 2019 5.705341352167411 2020 5.587619838311147 2021 11.056300322608404