Year Number 1996 91.3978500366211 1998 91.9786071777344 2000 92.0212783813477 2002 91.0052947998047 2003 91.0052947998047 2004 89.6551742553711 2005 83.9024353027344 2006 84.8780517578125 2007 78.1553421020508 2008 77.1844635009766 2009 78.4689025878906 2010 80 2011 79.620849609375 2012 78.6729888916016 2013 80.0947875976563 2014 78.8461532592773 2015 78.5714263916016 2016 80 2017 79.523811340332 2018 75.7142868041992 2019 73.8095245361328 2020 74.2857131958008 2021 80 2022 79.7169799804688