Year Number 2004 56.25 2005 64.9038467407227 2006 53.8461532592773 2007 52.8846168518066 2008 51.4423065185547 2009 71.5639801025391 2010 72.9857788085938 2011 74.6478881835938 2012 76.0563354492188 2013 75.5868530273438 2014 71.9211807250977 2015 72.4137954711914 2016 71.9211807250977 2017 73.8916244506836 2018 76.6990280151367 2019 72.9468612670898 2020 72.4637680053711 2021 64.7342987060547 2022 66.6666641235352