Year Number 1996 89.0710372924805 1998 88.5245895385742 2000 87.978141784668 2002 89.1891860961914 2003 90.8108139038086 2004 90.5472640991211 2005 91.1764678955078 2006 89.7560958862305 2007 87.8640747070313 2008 87.8640747070313 2009 84.6889953613281 2010 84.2105255126953 2011 84.3601913452148 2012 82.4644546508789 2013 81.9905242919922 2014 82.6923065185547 2015 82.8571395874023 2016 78.0952377319336 2017 81.4285736083984 2018 81.9047622680664 2019 82.3809509277344 2020 82.3809509277344 2021 84.2857131958008 2022 82.0754699707031