Year Number 1996 80.6451644897461 1998 81.2834243774414 2000 82.4468078613281 2002 83.0687866210938 2003 82.0105819702148 2004 69.4581298828125 2005 72.6829299926758 2006 73.1707305908203 2007 74.271842956543 2008 77.1844635009766 2009 74.6411514282227 2010 73.3333358764648 2011 72.511848449707 2012 76.3033142089844 2013 74.407585144043 2014 79.3269195556641 2015 63.8095245361328 2016 64.2857131958008 2017 63.8095245361328 2018 60 2019 58.5714302062988 2020 60 2021 62.8571434020996 2022 65.0943374633789