| Year | Value | | 2020 | 46.837001800537 | | 2019 | 46.65299987793 | | 2018 | 46.493000030518 | | 2017 | 46.471000671387 | | 2016 | 46.29700088501 | | 2015 | 46.05899810791 | | 2014 | 45.766998291016 | | 2013 | 45.525001525879 | | 2012 | 45.526000976562 | | 2011 | 45.331001281738 | | 2010 | 45.063999176025 | | 2009 | 44.790000915527 | | 2008 | 44.60599899292 | | 2007 | 44.39400100708 | | 2006 | 44.57500076294 | | 2005 | 44.556999206543 | | 2004 | 44.415000915527 | | 2003 | 44.360000610352 | | 2002 | 44.169998168945 | | 2001 | 43.916999816895 | | 2000 | 43.664001464844 | | 1999 | 43.418998718262 | | 1998 | 43.145999908447 | | 1997 | 42.926998138428 | | 1996 | 42.826999664307 | | 1995 | 42.722999572754 | | 1994 | 42.444999694824 | | 1993 | 42.151000976562 | | 1992 | 41.840999603271 | | 1991 | 41.712001800537 |
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