Year Number 1996 0.387751519680023 1998 0.222172737121582 2000 0.51749986410141 2002 0.199420601129532 2003 0.532275915145874 2004 0.380177587270737 2005 0.517519235610962 2006 0.53966498374939 2007 0.537055730819702 2008 0.639003932476044 2009 0.390287488698959 2010 0.452444821596146 2011 0.607984483242035 2012 0.635126054286957 2013 0.563347160816193 2014 0.551882088184357 2015 0.542449116706848 2016 0.593786835670471 2017 0.530973076820374 2018 0.484394073486328 2019 0.544513285160065 2020 0.288732588291168 2021 0.422054201364517 2022 0.418635070323944