Year | Value | 2022 | 24.722146496845 | 2021 | 24.467619940486 | 2020 | 24.248213180319 | 2019 | 24.48107659645 | 2018 | 24.334224449072 | 2017 | 24.075810198156 | 2016 | 23.769297225036 | 2015 | 23.649375335652 | 2014 | 23.453468400887 | 2013 | 23.165424836512 | 2012 | 22.829180661444 | 2011 | 22.247419422373 | 2010 | 21.867515417992 | 2009 | 21.415522786703 | 2008 | 21.014778482989 | 2007 | 20.573030370302 | 2006 | 20.156047153309 | 2005 | 19.764037777017 | 2004 | 19.485693908325 | 2003 | 19.240881519249 | 2002 | 19.247356567734 | 2001 | 19.295218774034 | 2000 | 19.057777921367 | 1999 | 18.863295017417 | 1998 | 18.644495491847 | 1997 | 18.44969761 | 1996 | 18.27207464144 | 1995 | 18.135334750535 | 1994 | 18.058175981709 | 1993 | 18.030319251054 | 1992 | 18.03093550842 | 1991 | 18.053992490702 |
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