Year | Value | 2022 | 81.655153940422 | 2021 | 81.406857199605 | 2020 | 81.160449127515 | 2019 | 80.912330798119 | 2018 | 80.669883914141 | 2017 | 80.426191259853 | 2016 | 80.170332606999 | 2015 | 79.907064496054 | 2014 | 79.638728579441 | 2013 | 79.367301959169 | 2012 | 79.093634175431 | 2011 | 78.814563413925 | 2010 | 78.526642317013 | 2009 | 78.243180353454 | 2008 | 77.952027818728 | 2007 | 77.653254182877 | 2006 | 77.347696406268 | 2005 | 77.038241425304 | 2004 | 76.725982814718 | 2003 | 76.408798255793 | 2002 | 76.079516285688 | 2001 | 75.743097319406 | 2000 | 75.376508091595 | 1999 | 74.9174657809 | 1998 | 74.45342647263 | 1997 | 73.972487999214 | 1996 | 73.485443896759 | 1995 | 73.006566695671 | 1994 | 72.504469290267 | 1993 | 71.997040085641 | 1992 | 71.495740210993 | 1991 | 70.981614777583 | 1990 | 70.447700392798 | 1989 | 69.888604008211 | 1988 | 69.317845289882 | 1987 | 68.737368999462 | 1986 | 68.15013652202 | 1985 | 67.552713722369 | 1984 | 66.942040097451 | 1983 | 66.326919325704 | 1982 | 65.707005323463 | 1981 | 65.069896584322 | 1980 | 64.405632362516 | 1979 | 63.702976994029 | 1978 | 62.990683745478 | 1977 | 62.27172306982 | 1976 | 61.550837415298 | 1975 | 60.830715333545 | 1974 | 60.106950986672 | 1973 | 59.383256561714 | 1972 | 58.654267615938 | 1971 | 57.902343177903 | 1970 | 57.140010858232 | 1969 | 56.369266394631 | 1968 | 55.593357669745 | 1967 | 54.812867741965 | 1966 | 54.033126903674 | 1965 | 53.252391373252 | 1964 | 52.471280888567 | 1963 | 51.632717277394 | 1962 | 50.799007432751 | 1961 | 49.968089434537 | 1960 | 49.15000449889 |
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