Year Number 1996 90.8602142333984 1998 90.3743286132813 2000 83.5106353759766 2002 82.539680480957 2003 83.0687866210938 2004 85.7142868041992 2005 82.4390258789063 2006 88.2926864624023 2007 85.4368896484375 2008 82.5242691040039 2009 84.6889953613281 2010 83.3333358764648 2011 83.4123229980469 2012 80.0947875976563 2013 79.620849609375 2014 79.3269195556641 2015 79.0476226806641 2016 80 2017 80.9523773193359 2018 81.4285736083984 2019 82.8571395874023 2020 80.476188659668 2021 80.476188659668 2022 81.1320724487305