Year % 2008 12.3072423893155 2009 4.93936020471561 2010 10.170039820498 2011 10.1507935356438 2012 10.1997863598347 2013 9.84656111881687 2014 11.3275844801466 2015 10.2270536856602 2016 10.6723576848779 2017 11.9661819723633 2018 11.3255898968925 2019 12.7567888164857 2020 11.8366710341198