Year | Value | 2021 | 61.223 | 2020 | 62.38 | 2019 | 62.793 | 2018 | 62.342 | 2017 | 62.12 | 2016 | 61.794 | 2015 | 61.208 | 2014 | 60.699 | 2013 | 59.878 | 2012 | 58.867 | 2011 | 57.771 | 2010 | 56.799 | 2009 | 55.3 | 2008 | 53.945 | 2007 | 52.739 | 2006 | 51.795 | 2005 | 50.659 | 2004 | 49.487 | 2003 | 48.284 | 2002 | 46.979 | 2001 | 46.019 | 2000 | 45.231 | 1999 | 44.659 | 1998 | 44.701 | 1997 | 44.945 | 1996 | 45.233 | 1995 | 45.553 | 1994 | 45.854 | 1993 | 46.209 | 1992 | 46.512 | 1991 | 47.097 | 1990 | 47.926 | 1989 | 48.696 | 1988 | 49.527 | 1987 | 50.328 | 1986 | 51.061 | 1985 | 51.902 | 1984 | 52.755 | 1983 | 53.389 | 1982 | 53.859 | 1981 | 54.047 | 1980 | 54.143 | 1979 | 54.439 | 1978 | 54.61 | 1977 | 54.709 | 1976 | 54.604 | 1975 | 54.239 | 1974 | 53.87 | 1973 | 53.3 | 1972 | 52.629 | 1971 | 52.023 | 1970 | 51.493 | 1969 | 51.147 | 1968 | 50.856 | 1967 | 50.802 | 1966 | 50.679 | 1965 | 50.563 | 1964 | 49.849 | 1963 | 50.133 | 1962 | 49.794 | 1961 | 49.452 | 1960 | 49.042 |
|