Year | Value | 2022 | 24.9963466971 | 2021 | 24.66173292267 | 2020 | 24.425250687326 | 2019 | 24.512619817245 | 2018 | 24.090493345529 | 2017 | 23.607817802915 | 2016 | 23.153995316122 | 2015 | 22.750013298917 | 2014 | 22.346899424135 | 2013 | 21.808079987694 | 2012 | 21.265627982171 | 2011 | 20.709741956769 | 2010 | 20.220368191508 | 2009 | 19.582494238107 | 2008 | 18.971573442057 | 2007 | 18.312915653574 | 2006 | 18.542876571321 | 2005 | 18.763244014815 | 2004 | 19.01118926263 | 2003 | 19.321600327286 | 2002 | 19.566535246008 | 2001 | 19.814692408372 | 2000 | 18.669527554735 | 1999 | 17.496084583828 | 1998 | 16.433775444164 | 1997 | 15.456262338615 | 1996 | 14.560530009415 | 1995 | 14.246231466714 | 1994 | 14.112359620286 | 1993 | 14.012132727432 | 1992 | 13.996652917807 | 1991 | 14.033401073751 |
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