Year | Value | 2022 | 39.664647913528 | 2021 | 39.630878823891 | 2020 | 39.259591454067 | 2019 | 40.884795335161 | 2018 | 40.824745943017 | 2017 | 40.352322897777 | 2016 | 40.738802255632 | 2015 | 39.053738930196 | 2014 | 38.1514191755 | 2013 | 37.511548238007 | 2012 | 36.710172083401 | 2011 | 35.483096073424 | 2010 | 34.446886234821 | 2009 | 34.051161060895 | 2008 | 33.96740974509 | 2007 | 33.720641331494 | 2006 | 33.441079135631 | 2005 | 33.06789164448 | 2004 | 32.221865687134 | 2003 | 31.674665785645 | 2002 | 31.610630332476 | 2001 | 31.307797052044 | 2000 | 30.994030850981 | 1999 | 30.873929086156 | 1998 | 30.792836291963 | 1997 | 31.055595957683 | 1996 | 30.676839568116 | 1995 | 30.508890688146 | 1994 | 30.511456416172 | 1993 | 30.388011303801 | 1992 | 30.439940826163 | 1991 | 30.419410852638 |
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