| Year | Value | | 2023 | 44.736642109345 | | 2022 | 44.855732195942 | | 2021 | 44.974822282538 | | 2020 | 45.093912369135 | | 2019 | 45.213002455732 | | 2018 | 45.332092542329 | | 2017 | 45.451182628926 | | 2016 | 45.570272715523 | | 2015 | 45.68936280212 | | 2014 | 45.808452888717 | | 2013 | 45.927542975313 | | 2012 | 46.04663306191 | | 2011 | 46.165723148507 | | 2010 | 46.284813235104 | | 2009 | 46.403903321701 | | 2008 | 46.522993408298 | | 2007 | 46.642083494895 | | 2006 | 46.761173581491 | | 2005 | 46.880263668088 | | 2004 | 46.999353754685 | | 2003 | 47.118443841282 | | 2002 | 47.237533927879 | | 2001 | 47.356624014476 | | 2000 | 47.475714101073 | | 1999 | 47.59480418767 | | 1998 | 47.713894274267 | | 1997 | 47.832984360863 | | 1996 | 47.95207444746 | | 1995 | 48.071164534057 | | 1994 | 48.190254620654 | | 1993 | 48.309344707251 | | 1992 | 48.428434793848 | | 1991 | 48.547524880445 | | 1990 | 48.666614967041 |
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