Year % 2005 9.43328616371471 2006 9.95712902677738 2007 9.37567481413804 2008 11.778881491518 2009 11.9455536060073 2010 11.2632577583634 2011 12.7574645426634 2012 12.609585095918 2013 12.1940673551832 2014 12.8922167628663 2015 13.0390994755939 2016 11.6943591663771 2017 13.8064720409132 2018 13.9015883334752 2019 13.6671318290233 2020 13.3717064798432 2021 14.6613584286501 2022 14.7992639933489