Year | Value | 2021 | 61.619 | 2020 | 61.035 | 2019 | 60.901 | 2018 | 60.244 | 2017 | 60.154 | 2016 | 59.55 | 2015 | 59.396 | 2014 | 58.853 | 2013 | 58.684 | 2012 | 58.073 | 2011 | 57.925 | 2010 | 57.304 | 2009 | 57.011 | 2008 | 56.695 | 2007 | 56.511 | 2006 | 56.222 | 2005 | 55.962 | 2004 | 55.569 | 2003 | 55.639 | 2002 | 55.311 | 2001 | 54.86 | 2000 | 54.742 | 1999 | 54.538 | 1998 | 54.199 | 1997 | 54.192 | 1996 | 54.098 | 1995 | 54.037 | 1994 | 54.037 | 1993 | 54.195 | 1992 | 54.299 | 1991 | 54.268 | 1990 | 54.37 | 1989 | 54.39 | 1988 | 54.348 | 1987 | 54.051 | 1986 | 53.713 | 1985 | 53.432 | 1984 | 53.089 | 1983 | 52.635 | 1982 | 52.256 | 1981 | 51.764 | 1980 | 51.227 | 1979 | 50.765 | 1978 | 50.232 | 1977 | 49.76 | 1976 | 49.328 | 1975 | 48.729 | 1974 | 48.099 | 1973 | 47.597 | 1972 | 47.089 | 1971 | 46.587 | 1970 | 46.12 | 1969 | 45.666 | 1968 | 45.284 | 1967 | 44.823 | 1966 | 44.373 | 1965 | 43.97 | 1964 | 43.702 | 1963 | 43.372 | 1962 | 43.154 | 1961 | 42.882 | 1960 | 42.692 |
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