Year % 2003 9.78 2004 10.52 2006 11.11 2007 12.13 2008 13.6 2009 13.54 2010 13.69 2011 15.43 2012 13.87 2013 14.13 2015 10.2 2017 14.08 2018 14.66 2019 16.99 2020 14.4 2021 9.92