Year | Value | 2022 | 55.597704806656 | 2021 | 55.298635746399 | 2020 | 54.999491902232 | 2019 | 55.260057089873 | 2018 | 54.729773180254 | 2017 | 54.158338784448 | 2016 | 53.744896172078 | 2015 | 53.181969179041 | 2014 | 52.335731351369 | 2013 | 51.628379991931 | 2012 | 50.940326010157 | 2011 | 50.114643587502 | 2010 | 49.202395968143 | 2009 | 48.350855874786 | 2008 | 47.591609279989 | 2007 | 46.684946418486 | 2006 | 45.923222721402 | 2005 | 45.041940899529 | 2004 | 44.105157928608 | 2003 | 43.001336263345 | 2002 | 42.402473963389 | 2001 | 41.888227669723 | 2000 | 40.893498509384 | 1999 | 40.350435887597 | 1998 | 39.937940531036 | 1997 | 39.661645411703 | 1996 | 38.9143043945 | 1995 | 38.202963548974 | 1994 | 37.534303361861 | 1993 | 36.898807450287 | 1992 | 36.216161268308 | 1991 | 35.752988777937 |
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