Year % 1995 4.41 1997 5.39 2002 6.49 2006 5.92 2007 6.77 2008 6.78 2009 3.1 2010 3.28 2011 3.28 2012 3.39 2013 3.58 2014 3.33 2015 3.25 2016 3.25 2017 3.4 2018 3.33 2019 3.33 2020 3.56 2021 3.66