Year | Value | 2021 | 79.329108077565 | 2020 | 79.700026525922 | 2019 | 79.659351759704 | 2018 | 79.483633514522 | 2017 | 79.197033179943 | 2016 | 78.988996791781 | 2015 | 78.765728303379 | 2014 | 78.540038816605 | 2013 | 78.298836678261 | 2012 | 78.03528328421 | 2011 | 77.747758111309 | 2010 | 77.509690734681 | 2009 | 77.330881890688 | 2008 | 76.719507042016 | 2007 | 76.813106089729 | 2006 | 76.548688725459 | 2005 | 76.201367955926 | 2004 | 75.68541751608 | 2003 | 75.640592760201 | 2002 | 75.16960774632 | 2001 | 74.858664116504 | 2000 | 74.071618648413 | 1999 | 73.629557188816 | 1998 | 73.57105914887 | 1997 | 73.089568052629 | 1996 | 72.71745779496 | 1995 | 72.46489252184 | 1994 | 72.159757808684 | 1993 | 71.975716645117 | 1992 | 71.422544142996 | 1991 | 70.902107284951 | 1990 | 70.8390607009 | 1989 | 70.666015591834 | 1988 | 70.340861029297 | 1987 | 70.075255212926 | 1986 | 69.72227661954 | 1985 | 69.335960357918 | 1984 | 68.965305319595 | 1983 | 68.582789260913 | 1982 | 68.169745972616 | 1981 | 67.686961346338 | 1980 | 67.21016011326 | 1979 | 66.716481834086 | 1978 | 66.119364679583 | 1977 | 65.475530862283 | 1976 | 64.717288003935 | 1975 | 63.976539849788 | 1974 | 63.291663373322 | 1973 | 62.608839837465 | 1972 | 61.754518323615 | 1971 | 61.170109812288 | 1970 | 60.39499305098 | 1969 | 59.77494320067 | 1968 | 59.15637137235 | 1967 | 58.719906797852 | 1966 | 57.920268219056 | 1965 | 57.056422079248 | 1964 | 56.845611093208 | 1963 | 56.135944556974 | 1962 | 55.583016049886 | 1961 | 48.591574584928 | 1960 | 43.47608433744 |
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