Year Number 1996 0.937576174736023 1998 0.93450403213501 2000 0.803981602191925 2002 0.691441357135773 2003 0.59484726190567 2004 0.649413287639618 2005 0.441597372293472 2006 0.782895863056183 2007 0.863329768180847 2008 0.937762975692749 2009 0.891080617904663 2010 0.894677519798279 2011 0.970096409320831 2012 0.938719630241394 2013 0.916024446487427 2014 0.955262124538422 2015 0.942406356334686 2016 0.974187254905701 2017 0.96415501832962 2018 0.975099623203278 2019 0.947817027568817 2020 0.910778641700745 2021 0.928584516048431 2022 0.935108244419098