Year | Value | 2023 | 63.651 | 2022 | 62.882 | 2021 | 62.101 | 2020 | 62.569 | 2019 | 62.18 | 2018 | 61.806 | 2017 | 61.345 | 2016 | 60.789 | 2015 | 60.107 | 2014 | 59.764 | 2013 | 59.179 | 2012 | 58.501 | 2011 | 57.804 | 2010 | 57.088 | 2009 | 56.422 | 2008 | 55.581 | 2007 | 54.832 | 2006 | 53.962 | 2005 | 53.053 | 2004 | 52.217 | 2003 | 50.997 | 2002 | 49.924 | 2001 | 48.509 | 2000 | 47.617 | 1999 | 47.627 | 1998 | 46.678 | 1997 | 45.721 | 1996 | 44.807 | 1995 | 44.589 | 1994 | 44.515 | 1993 | 37.221 | 1992 | 44.469 | 1991 | 44.66 | 1990 | 45.184 | 1989 | 45.745 | 1988 | 42.889 | 1987 | 47.066 | 1986 | 47.402 | 1985 | 47.662 | 1984 | 47.687 | 1983 | 47.433 | 1982 | 47.012 | 1981 | 46.412 | 1980 | 45.731 | 1979 | 45.038 | 1978 | 44.404 | 1977 | 43.97 | 1976 | 43.691 | 1975 | 43.445 |
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