Year | Value | 2021 | 62.072 | 2020 | 62.355 | 2019 | 62.298 | 2018 | 62.164 | 2017 | 61.694 | 2016 | 61.554 | 2015 | 60.373 | 2014 | 60.213 | 2013 | 61.124 | 2012 | 61.148 | 2011 | 60.842 | 2010 | 60.644 | 2009 | 60.551 | 2008 | 60.137 | 2007 | 59.692 | 2006 | 59.063 | 2005 | 58.544 | 2004 | 57.686 | 2003 | 55.527 | 2002 | 55.495 | 2001 | 54.534 | 2000 | 53.214 | 1999 | 52.125 | 1998 | 50.818 | 1997 | 49.768 | 1996 | 47.052 | 1995 | 46.399 | 1994 | 44.736 | 1993 | 44.752 | 1992 | 45.361 | 1991 | 44.802 | 1990 | 44.219 | 1989 | 45.092 | 1988 | 45.515 | 1987 | 45.975 | 1986 | 46.44 | 1985 | 46.361 | 1984 | 46.898 | 1983 | 46.81 | 1982 | 46.653 | 1981 | 46.473 | 1980 | 46.21 | 1979 | 45.85 | 1978 | 45.607 | 1977 | 45.201 | 1976 | 44.789 | 1975 | 44.344 | 1974 | 44.038 | 1973 | 43.607 | 1972 | 43.184 | 1971 | 42.665 | 1970 | 42.309 | 1969 | 41.91 | 1968 | 41.483 | 1967 | 41.101 | 1966 | 40.849 | 1965 | 40.554 | 1964 | 40.334 | 1963 | 40.22 | 1962 | 40.18 | 1961 | 40.093 | 1960 | 40.084 |
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