Year current international $ 2000 35.9993546178273 2001 37.3019674626799 2002 38.5441492942959 2003 41.3745455824281 2004 43.0306001472854 2005 44.124687921449 2006 47.374214000719 2007 52.408190922485 2008 53.6585606318682 2009 58.8230962780634 2010 67.2088446439897 2011 72.6692179835751 2012 77.8386250019654 2013 83.2470930485353 2014 89.1701222257326 2015 91.5679768694709 2016 126.382565408115 2017 128.105431041152 2018 125.995321862045 2019 124.162837911897 2020 131.635664404807 2021 129.874482564671