Year Number 1996 64.6739120483398 1998 64.1304321289063 2000 63.5869560241699 2002 67.5675659179688 2003 68.1081085205078 2004 68.6567153930664 2005 67.6470565795898 2006 69.6078414916992 2007 69.9029159545898 2008 67.4757308959961 2009 70.3349304199219 2010 70.8134002685547 2011 73.459716796875 2012 72.511848449707 2013 72.511848449707 2014 76.4423065185547 2015 74.7619018554688 2016 75.2380981445313 2017 75.7142868041992 2018 75.2380981445313 2019 75.2380981445313 2020 74.7619018554688 2021 77.6190490722656 2022 75.9433975219727