Year | Value | 2021 | 55.927 | 2020 | 57.537 | 2019 | 57.053 | 2018 | 56.591 | 2017 | 55.9 | 2016 | 55.096 | 2015 | 53.86 | 2014 | 52.807 | 2013 | 51.753 | 2012 | 50.486 | 2011 | 49.261 | 2010 | 48.176 | 2009 | 46.107 | 2008 | 46.075 | 2007 | 45.619 | 2006 | 45.302 | 2005 | 45.428 | 2004 | 45.93 | 2003 | 46.633 | 2002 | 47.743 | 2001 | 49.02 | 2000 | 50.916 | 1999 | 52.92 | 1998 | 55.12 | 1997 | 57.218 | 1996 | 59.157 | 1995 | 60.879 | 1994 | 62.331 | 1993 | 62.3 | 1992 | 62.923 | 1991 | 63.438 | 1990 | 63.928 | 1989 | 64.109 | 1988 | 64.458 | 1987 | 64.388 | 1986 | 64.348 | 1985 | 63.95 | 1984 | 63.5 | 1983 | 62.955 | 1982 | 62.42 | 1981 | 61.836 | 1980 | 60.952 | 1979 | 60.174 | 1978 | 59.398 | 1977 | 58.634 | 1976 | 57.989 | 1975 | 57.215 | 1974 | 56.333 | 1973 | 56.124 | 1972 | 55.594 | 1971 | 55.111 | 1970 | 54.715 | 1969 | 54.324 | 1968 | 54.036 | 1967 | 53.689 | 1966 | 53.533 | 1965 | 53.436 | 1964 | 53.479 | 1963 | 53.467 | 1962 | 53.633 | 1961 | 53.618 | 1960 | 53.519 |
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