Year % 2005 7.77656060636301 2006 7.63777895246626 2007 7.83432458392869 2008 7.579854891937 2009 7.86664838953077 2010 8.18652095676075 2011 8.62814831400534 2012 9.00423180425004 2013 9.59759906195034 2014 9.961614035339 2015 10.7746096789164 2016 12.4254380685723 2017 14.6182982891751 2018 12.8231121824865 2019 13.4039163891179 2020 12.5634216351375 2021 13.1696920960953 2022 13.28970234714