Year | Value | 2022 | 62.17 | 2021 | 62.066 | 2020 | 61.975 | 2019 | 61.897 | 2018 | 61.834 | 2017 | 61.784 | 2016 | 61.734 | 2015 | 61.683 | 2014 | 61.633 | 2013 | 61.583 | 2012 | 61.459 | 2011 | 60.889 | 2010 | 60.317 | 2009 | 59.742 | 2008 | 59.166 | 2007 | 58.585 | 2006 | 58.002 | 2005 | 57.417 | 2004 | 56.831 | 2003 | 56.242 | 2002 | 55.888 | 2001 | 55.967 | 2000 | 56.047 | 1999 | 56.126 | 1998 | 56.205 | 1997 | 56.285 | 1996 | 56.393 | 1995 | 56.637 | 1994 | 56.881 | 1993 | 57.124 | 1992 | 57.367 | 1991 | 57.61 | 1990 | 57.852 | 1989 | 58.094 | 1988 | 58.31 | 1987 | 58.419 | 1986 | 58.527 | 1985 | 58.635 | 1984 | 58.743 | 1983 | 58.836 | 1982 | 58.892 | 1981 | 58.948 | 1980 | 59.003 | 1979 | 59.059 | 1978 | 59.115 | 1977 | 59.171 | 1976 | 58.76 | 1975 | 58.252 | 1974 | 57.742 | 1973 | 57.231 | 1972 | 56.718 | 1971 | 56.203 | 1970 | 55.162 | 1969 | 53.773 | 1968 | 52.38 | 1967 | 50.979 | 1966 | 49.578 | 1965 | 48.178 | 1964 | 46.783 | 1963 | 45.389 | 1962 | 44.16 | 1961 | 43.217 | 1960 | 42.281 |
|