Year | Value | 2022 | 76.547952203503 | 2021 | 76.09373551081 | 2020 | 75.57187589925 | 2019 | 75.363014194507 | 2018 | 74.879785940571 | 2017 | 74.682021687739 | 2016 | 74.493714696801 | 2015 | 74.146615273108 | 2014 | 73.407006066532 | 2013 | 72.705545744869 | 2012 | 71.846175761915 | 2011 | 71.60038938111 | 2010 | 70.907525029338 | 2009 | 69.864022598631 | 2008 | 68.624001384002 | 2007 | 67.892533344578 | 2006 | 66.905738160366 | 2005 | 66.014610545745 | 2004 | 65.405790302049 | 2003 | 64.880964986242 | 2002 | 63.934796594832 | 2001 | 63.38129549495 | 2000 | 63.250296436049 | 1999 | 62.722346577754 | 1998 | 62.42339772693 | 1997 | 62.390840024812 | 1996 | 61.817646797677 | 1995 | 61.274830154401 | 1994 | 60.792711888865 | 1993 | 60.40415761486 | 1992 | 60.066306705676 | 1991 | 59.715022788987 |
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