| Year | Value | | 2021 | 45.730560511424 | | 2020 | 45.64686659189 | | 2019 | 45.639999740951 | | 2018 | 45.628804558995 | | 2017 | 45.602901178604 | | 2016 | 45.17549540215 | | 2015 | 45.253205543323 | | 2014 | 45.532245532245 | | 2013 | 45.596995596996 | | 2012 | 45.654408908455 | | 2011 | 45.371487763822 | | 2010 | 45.628900686262 | | 2009 | 45.907172449508 | | 2008 | 46.240419471776 | | 2007 | 46.559223300971 | | 2006 | 46.161165048544 | | 2005 | 46.666968677194 | | 2004 | 47.002200362413 | | 2003 | 47.475346188689 | | 2002 | 47.263621068979 | | 2001 | 55.36430697554 | | 2000 | 55.390190242009 | | 1999 | 55.416073508477 | | 1998 | 55.441956774945 | | 1997 | 55.390190242009 | | 1996 | 55.390190242009 | | 1995 | 55.390190242009 | | 1994 | 55.441956774945 | | 1993 | 55.416073508477 |
|