Year years 2003 2.3 2004 2.3 2005 2.3000000000000003 2006 2.425 2007 2.425 2008 2.425 2009 2.425 2010 2.425 2011 2.425 2012 2.425 2013 2.4250000000000003 2014 2.425 2015 2.425 2016 2.425 2017 2.425 2018 2.4250000000000003 2019 2.4250000000000003