Year Number 2004 70.1492538452148 2005 73.0392150878906 2006 80 2007 87.3786392211914 2008 84.4660186767578 2009 84.2105255126953 2010 84.6889953613281 2011 84.3601913452148 2012 82.4644546508789 2013 81.9905242919922 2014 86.538459777832 2015 85.2380981445313 2016 84.7619018554688 2017 85.7142868041992 2018 86.6666641235352 2019 85.2380981445313 2020 90 2021 90.9523773193359 2022 91.0377349853516