Year % 2003 9.33 2004 10.43 2006 9.59 2007 10.18 2008 11.18 2009 12.69 2010 12.58 2011 14.39 2012 13.07 2013 12.95 2015 12.42 2017 12.68 2018 12.94 2019 12.53 2020 11.21 2021 4.86