| Year | Value | | 2022 | 70.272720116812 | | 2021 | 69.926910167136 | | 2020 | 69.834589430454 | | 2019 | 68.463781790775 | | 2018 | 67.991747414699 | | 2017 | 67.819313345559 | | 2016 | 67.554799975061 | | 2015 | 66.864079966925 | | 2014 | 66.06357578136 | | 2013 | 64.076299369554 | | 2012 | 62.932979106 | | 2011 | 61.711257143143 | | 2010 | 60.899352249781 | | 2009 | 60.027802989704 | | 2008 | 60.992486322215 | | 2007 | 60.462081038177 | | 2006 | 58.905067332541 | | 2005 | 56.74019691725 | | 2004 | 54.470440027785 | | 2003 | 50.632506960526 | | 2002 | 49.755682615055 | | 2001 | 47.179998902926 | | 2000 | 48.597510669031 | | 1999 | 47.921903437199 | | 1998 | 47.793288937491 | | 1997 | 47.382345098598 | | 1996 | 47.109405010711 | | 1995 | 46.832827307751 | | 1994 | 46.607380240684 | | 1993 | 46.458279563036 | | 1992 | 46.24650074744 | | 1991 | 46.09805033727 |
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