Year Number 1996 81.1827926635742 1998 81.2834243774414 2000 81.9148941040039 2002 82.539680480957 2003 80.9523773193359 2004 70.4433517456055 2005 69.7560958862305 2006 62.4390258789063 2007 58.2524261474609 2008 59.2233009338379 2009 62.2009582519531 2010 61.4285697937012 2011 58.7677726745605 2012 59.2417068481445 2013 58.2938385009766 2014 61.0576934814453 2015 58.5714302062988 2016 58.0952377319336 2017 67.6190490722656 2018 65.2380981445313 2019 65.2380981445313 2020 66.6666641235352 2021 61.4285697937012 2022 61.3207550048828