Year Number 1996 85.3260879516602 1998 85.3260879516602 2000 77.7173919677734 2002 72.9729766845703 2003 73.5135116577148 2004 74.1293563842773 2005 75.9803924560547 2006 73.529411315918 2007 74.271842956543 2008 67.4757308959961 2009 68.8995208740234 2010 77.511962890625 2011 75.8293838500977 2012 74.407585144043 2013 76.7772521972656 2014 83.1730804443359 2015 80 2016 80.9523773193359 2017 80 2018 79.0476226806641 2019 75.7142868041992 2020 81.4285736083984 2021 82.8571395874023 2022 81.1320724487305