Year % 2001 12.42 2002 12.42 2003 12.73 2004 12.92 2005 10.68 2006 11.23 2007 16.88 2008 11.72 2009 10 2010 12.75 2011 12 2012 10.76 2013 13.16 2014 9.85 2017 17.8 2018 15.89 2019 13.42 2020 13.15 2021 13.26