Year | Value | 2021 | 59.757931844888 | 2020 | 59.437328632981 | 2019 | 59.116725421073 | 2018 | 58.796122209166 | 2017 | 58.47571484528 | 2016 | 58.155111633372 | 2015 | 57.834508421465 | 2014 | 57.513983548766 | 2013 | 57.193458676067 | 2012 | 56.872933803369 | 2011 | 56.55240893067 | 2010 | 56.231884057971 | 2009 | 56.204504504504 | 2008 | 56.177124951038 | 2007 | 56.149745397572 | 2006 | 56.122365844105 | 2005 | 56.094986290639 | 2004 | 56.067606737172 | 2003 | 56.040227183705 | 2002 | 56.012847630239 | 2001 | 55.985468076772 | 2000 | 55.958088523306 | 1999 | 56.056365060713 | 1998 | 56.15464159812 | 1997 | 56.252918135527 | 1996 | 56.351194672934 | 1995 | 56.449471210341 | 1994 | 56.547747747748 | 1993 | 56.646024285155 | 1992 | 56.744300822562 | 1991 | 56.842577359969 | 1990 | 56.940853897376 |
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