Year | Value | 2022 | 63.053 | 2021 | 63.519 | 2020 | 63.785 | 2019 | 62.747 | 2018 | 64.053 | 2017 | 63.76 | 2016 | 63.577 | 2015 | 63.233 | 2014 | 62.95 | 2013 | 62.695 | 2012 | 62.317 | 2011 | 61.992 | 2010 | 61.683 | 2009 | 61.088 | 2008 | 60.426 | 2007 | 59.643 | 2006 | 58.878 | 2005 | 58.126 | 2004 | 56.986 | 2003 | 55.948 | 2002 | 55.088 | 2001 | 54.395 | 2000 | 53.682 | 1999 | 52.757 | 1998 | 50.894 | 1997 | 47.19 | 1996 | 53.491 | 1995 | 53.644 | 1994 | 53.738 | 1993 | 54.146 | 1992 | 54.663 | 1991 | 55.243 | 1990 | 55.926 | 1989 | 56.513 | 1988 | 57.009 | 1987 | 57.431 | 1986 | 57.552 | 1985 | 57.517 | 1984 | 57.453 | 1983 | 57.232 | 1982 | 57.019 | 1981 | 56.827 | 1980 | 56.593 | 1979 | 56.314 | 1978 | 56.065 | 1977 | 55.806 | 1976 | 55.602 | 1975 | 55.323 | 1974 | 55.059 |
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