Year | Value | 2021 | 67.975137160291 | 2020 | 68.774386474001 | 2019 | 70.442471938728 | 2018 | 70.108901640869 | 2017 | 69.94065790966 | 2016 | 69.409115795137 | 2015 | 69.065421985719 | 2014 | 68.780287805866 | 2013 | 68.558021535189 | 2012 | 68.088894433351 | 2011 | 67.647984253494 | 2010 | 67.136709126819 | 2009 | 66.737356262962 | 2008 | 66.089494562241 | 2007 | 65.727945855685 | 2006 | 65.201837024149 | 2005 | 64.502118470904 | 2004 | 64.424204392883 | 2003 | 64.106995499956 | 2002 | 63.991221826732 | 2001 | 63.883234327046 | 2000 | 63.686798967074 | 1999 | 63.581671407832 | 1998 | 63.962206355591 | 1997 | 63.477097682964 | 1996 | 62.831461188704 | 1995 | 62.110658580898 | 1994 | 61.971519652464 | 1993 | 62.239185178195 | 1992 | 63.403960334469 | 1991 | 64.378813759129 | 1990 | 64.664448674276 | 1989 | 64.87746941738 | 1988 | 64.918204910149 | 1987 | 64.939754041751 | 1986 | 64.781583339571 | 1985 | 63.682511215374 | 1984 | 63.162948550226 | 1983 | 63.281599533534 | 1982 | 63.224999403983 | 1981 | 62.86088623257 | 1980 | 62.532006014027 | 1979 | 62.40766133415 | 1978 | 62.497501350114 | 1977 | 62.453259550199 | 1976 | 62.607251614436 | 1975 | 62.614421295108 | 1974 | 62.86972904222 | 1973 | 62.790223906456 | 1972 | 62.636718305844 | 1971 | 62.423133117181 | 1970 | 62.221388917219 | 1969 | 61.73276834558 | 1968 | 62.145702299207 | 1967 | 62.128107961001 | 1966 | 62.408705144581 | 1965 | 62.321864806392 | 1964 | 62.431800492206 | 1963 | 61.937785009032 | 1962 | 61.386567214475 | 1961 | 61.548106465941 | 1960 | 61.355056651468 |
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