Year Number 1996 75.2688140869141 1998 77.0053482055664 2000 74.4680862426758 2002 70.3703689575195 2003 72.4867706298828 2004 63.0541877746582 2005 65.365852355957 2006 70.2439041137695 2007 71.8446578979492 2008 71.8446578979492 2009 73.2057418823242 2010 72.8571395874023 2011 72.0379180908203 2012 72.0379180908203 2013 70.6161117553711 2014 75 2015 74.2857131958008 2016 73.3333358764648 2017 64.2857131958008 2018 67.1428604125977 2019 71.9047622680664 2020 74.2857131958008 2021 66.6666641235352 2022 66.9811325073242