Year | Value | 2022 | 78.242 | 2021 | 77.757 | 2020 | 78.165 | 2019 | 78.98 | 2018 | 78.816 | 2017 | 78.612 | 2016 | 78.462 | 2015 | 78.342 | 2014 | 78.2 | 2013 | 78.126 | 2012 | 78.03 | 2011 | 77.882 | 2010 | 77.737 | 2009 | 77.323 | 2008 | 76.838 | 2007 | 76.281 | 2006 | 75.842 | 2005 | 75.617 | 2004 | 75.308 | 2003 | 75.126 | 2002 | 74.772 | 2001 | 74.634 | 2000 | 74.099 | 1999 | 73.735 | 1998 | 73.245 | 1997 | 73.233 | 1996 | 73.182 | 1995 | 72.802 | 1994 | 72.596 | 1993 | 72.578 | 1992 | 72.112 | 1991 | 72.05 | 1990 | 71.84 | 1989 | 71.787 | 1988 | 71.715 | 1987 | 71.6 | 1986 | 71.469 | 1985 | 71.269 | 1984 | 71.154 | 1983 | 70.684 | 1982 | 70.465 | 1981 | 70.269 | 1980 | 69.821 | 1979 | 69.554 | 1978 | 68.972 | 1977 | 68.718 | 1976 | 68.132 | 1975 | 67.484 | 1974 | 66.935 |
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