Year Number 1996 73.9361724853516 1998 76.0638275146484 2000 81.4814834594727 2002 83.5978851318359 2003 71.8592987060547 2004 73.3009719848633 2005 68.4466018676758 2006 72.4637680053711 2007 75.8454132080078 2008 73.0769195556641 2009 79.1469192504883 2010 76.7772521972656 2011 72.9857788085938 2012 86.2559204101563 2013 82.9383850097656 2014 89.0476226806641 2015 84.2857131958008 2016 79.0476226806641 2017 77.6190490722656 2018 83.0188674926758 2019 78.301887512207 2020 72.6415100097656 2021 69.8113174438477 2022 73.5849075317383