Year | Value | 2023 | 74.43 | 2022 | 74.886 | 2021 | 75.332 | 2020 | 75.768 | 2019 | 76.195 | 2018 | 76.612 | 2017 | 77.02 | 2016 | 77.418 | 2015 | 77.812 | 2014 | 78.201 | 2013 | 78.585 | 2012 | 78.963 | 2011 | 79.337 | 2010 | 79.706 | 2009 | 80.07 | 2008 | 80.429 | 2007 | 80.587 | 2006 | 80.707 | 2005 | 80.826 | 2004 | 80.945 | 2003 | 81.063 | 2002 | 81.18 | 2001 | 81.297 | 2000 | 81.414 | 1999 | 81.53 | 1998 | 81.645 | 1997 | 81.94 | 1996 | 82.317 | 1995 | 82.689 | 1994 | 83.054 | 1993 | 83.413 | 1992 | 83.766 | 1991 | 84.113 | 1990 | 84.454 | 1989 | 84.789 | 1988 | 85.117 | 1987 | 85.441 | 1986 | 85.758 | 1985 | 86.069 | 1984 | 86.374 | 1983 | 86.675 | 1982 | 86.969 | 1981 | 87.258 | 1980 | 90.102 | 1979 | 94.001 | 1978 | 94.422 | 1977 | 94.814 | 1976 | 95.18 | 1975 | 95.523 | 1974 | 70.945 |
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