Year Number 1996 64.6739120483398 1998 61.4130439758301 2000 67.3913040161133 2002 72.4324340820313 2003 77.2972946166992 2004 78.6069641113281 2005 78.4313735961914 2006 73.529411315918 2007 73.7864074707031 2008 66.019416809082 2009 70.3349304199219 2010 68.4210510253906 2011 69.1943130493164 2012 68.2464447021484 2013 67.7725143432617 2014 61.538459777832 2015 62.3809509277344 2016 60.476188659668 2017 60.9523811340332 2018 64.2857131958008 2019 64.2857131958008 2020 64.2857131958008 2021 66.1904754638672 2022 67.9245300292969