Year years 2003 9.2 2004 9.2 2005 9.2 2006 9.2 2007 6.5 2008 6.5 2009 6.5 2010 3.2 2011 3.2 2012 3.2 2013 2.1 2014 2.1 2015 2.1 2016 2.1 2017 2.1 2018 2.1 2019 2.1