Year | Value | 2022 | 22.225163562929 | 2021 | 21.939202399974 | 2020 | 21.846076151897 | 2019 | 22.352083741127 | 2018 | 22.45926628991 | 2017 | 22.466130157475 | 2016 | 22.579607929673 | 2015 | 22.630685883196 | 2014 | 22.514276662331 | 2013 | 22.359226930821 | 2012 | 22.137376665932 | 2011 | 21.739056536304 | 2010 | 21.343735702099 | 2009 | 21.480451133325 | 2008 | 21.351642682779 | 2007 | 21.014982509951 | 2006 | 20.652640976967 | 2005 | 20.495112962832 | 2004 | 20.479374325219 | 2003 | 20.422257142397 | 2002 | 20.617232759733 | 2001 | 20.838258623762 | 2000 | 20.779974263546 | 1999 | 20.647901214105 | 1998 | 20.504846698163 | 1997 | 20.419937594308 | 1996 | 20.318647542205 | 1995 | 20.233623127748 | 1994 | 20.212177537534 | 1993 | 20.234549638048 | 1992 | 20.29808093033 | 1991 | 20.392440970071 |
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