Year % 2001 8.33 2002 7.42 2004 7.97 2005 8.07 2006 8.03 2007 7.84 2008 7.8 2009 7.77 2010 7.69 2011 7.67 2012 7.6 2013 7.59 2014 7.56 2015 7.61 2016 7.69 2017 7.84 2018 7.88 2019 10.18 2020 7.82 2021 7.89