Year | Value | 2022 | 72.622 | 2021 | 72.291 | 2020 | 72.724 | 2019 | 72.873 | 2018 | 72.778 | 2017 | 72.689 | 2016 | 72.666 | 2015 | 72.02 | 2014 | 71.881 | 2013 | 71.665 | 2012 | 71.026 | 2011 | 70.726 | 2010 | 69.834 | 2009 | 69.575 | 2008 | 68.479 | 2007 | 67.698 | 2006 | 67.01 | 2005 | 66.209 | 2004 | 65.46 | 2003 | 64.643 | 2002 | 63.316 | 2001 | 61.91 | 2000 | 60.53 | 1999 | 59.575 | 1998 | 58.909 | 1997 | 58.622 | 1996 | 58.4 | 1995 | 58.217 | 1994 | 58.047 | 1993 | 58.245 | 1992 | 58.213 | 1991 | 58.071 | 1990 | 57.987 | 1989 | 57.466 | 1988 | 56.569 | 1987 | 55.983 | 1986 | 55.356 | 1985 | 55.188 | 1984 | 54.434 | 1983 | 53.703 | 1982 | 53.011 | 1981 | 52.439 | 1980 | 51.647 | 1979 | 50.469 | 1978 | 45.616 | 1977 | 32.301 | 1976 | 14.008 | 1975 | 17.396 | 1974 | 48.405 |
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