Year | Value | 2022 | 74.992 | 2021 | 74.626 | 2020 | 75.723 | 2019 | 76.248 | 2018 | 76.072 | 2017 | 75.903 | 2016 | 75.617 | 2015 | 75.683 | 2014 | 75.601 | 2013 | 75.636 | 2012 | 75.531 | 2011 | 75.465 | 2010 | 75.404 | 2009 | 74.56 | 2008 | 74.147 | 2007 | 74.21 | 2006 | 74.026 | 2005 | 73.811 | 2004 | 73.576 | 2003 | 73.752 | 2002 | 73.726 | 2001 | 73.647 | 2000 | 73.569 | 1999 | 73.561 | 1998 | 73.491 | 1997 | 73.452 | 1996 | 73.448 | 1995 | 73.349 | 1994 | 73.272 | 1993 | 73.225 | 1992 | 73.179 | 1991 | 73.1 | 1990 | 73.076 | 1989 | 73.023 | 1988 | 73.047 | 1987 | 72.789 | 1986 | 72.462 | 1985 | 72.388 | 1984 | 72.251 | 1983 | 72.105 | 1982 | 71.959 | 1981 | 71.722 | 1980 | 71.066 | 1979 | 70.778 | 1978 | 70.494 | 1977 | 70.264 | 1976 | 70.035 | 1975 | 69.762 | 1974 | 69.503 |
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