Year Number 1996 69.0217361450195 1998 64.6739120483398 2000 67.3913040161133 2002 68.6486511230469 2003 73.5135116577148 2004 77.6119384765625 2005 77.9411773681641 2006 75.9803924560547 2007 77.1844635009766 2008 78.1553421020508 2009 74.6411514282227 2010 78.4689025878906 2011 75.8293838500977 2012 74.407585144043 2013 74.8815155029297 2014 72.5961532592773 2015 74.7619018554688 2016 73.3333358764648 2017 75.7142868041992 2018 75.2380981445313 2019 82.3809509277344 2020 74.7619018554688 2021 76.6666641235352 2022 75.9433975219727