Year % 2002 8.21 2004 8.19 2005 7.98 2006 7.98 2008 7.81 2009 7.77 2010 7.91 2011 7.84 2012 7.73 2013 7.7 2014 11.19 2015 10.91 2016 10.9 2018 8.54 2019 8.65 2020 10.51 2021 12.03