Year Number 1996 0.58460944890976 1998 0.430778682231903 2000 0.416957408189774 2002 0.588606655597687 2003 0.456945091485977 2004 0.303184807300568 2005 0.492236137390137 2006 0.379883676767349 2007 0.563164889812469 2008 0.541956722736359 2009 0.624378561973572 2010 0.633332192897797 2011 0.539623916149139 2012 0.415858507156372 2013 0.397564351558685 2014 0.435458540916443 2015 0.455125451087952 2016 0.505491554737091 2017 0.405030578374863 2018 0.505017399787903 2019 0.643163442611694 2020 0.730151116847992 2021 0.799935340881348 2022 0.849962711334229