Year | Value | 2021 | 60.423 | 2020 | 60.715 | 2019 | 60.893 | 2018 | 60.587 | 2017 | 60.1 | 2016 | 59.4 | 2015 | 59.071 | 2014 | 58.462 | 2013 | 57.596 | 2012 | 56.789 | 2011 | 56.116 | 2010 | 55.249 | 2009 | 54.7 | 2008 | 54.211 | 2007 | 53.659 | 2006 | 52.76 | 2005 | 51.596 | 2004 | 50.182 | 2003 | 48.759 | 2002 | 47.668 | 2001 | 46.882 | 2000 | 46.044 | 1999 | 45.38 | 1998 | 44.75 | 1997 | 44.651 | 1996 | 44.251 | 1995 | 44.287 | 1994 | 44.072 | 1993 | 44.084 | 1992 | 44.045 | 1991 | 43.86 | 1990 | 43.918 | 1989 | 43.711 | 1988 | 43.865 | 1987 | 43.717 | 1986 | 41.383 | 1985 | 41.393 | 1984 | 39.465 | 1983 | 39.21 | 1982 | 38.878 | 1981 | 39.261 | 1980 | 39.066 | 1979 | 41.8 | 1978 | 41.983 | 1977 | 42.817 | 1976 | 43.188 | 1975 | 43.562 | 1974 | 43.45 | 1973 | 44.122 | 1972 | 43.762 | 1971 | 43.733 | 1970 | 47.115 | 1969 | 47.051 | 1968 | 46.805 | 1967 | 46.583 | 1966 | 45.936 | 1965 | 45.904 | 1964 | 45.669 | 1963 | 45.257 | 1962 | 44.785 | 1961 | 44.144 | 1960 | 43.398 |
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