Year | Value | 2022 | 56.769 | 2021 | 56.124 | 2020 | 55.475 | 2019 | 54.821 | 2018 | 54.162 | 2017 | 53.5 | 2016 | 52.835 | 2015 | 52.168 | 2014 | 51.5 | 2013 | 52.529 | 2012 | 53.555 | 2011 | 54.58 | 2010 | 55.6 | 2009 | 55.237 | 2008 | 54.875 | 2007 | 54.511 | 2006 | 54.146 | 2005 | 53.782 | 2004 | 53.417 | 2003 | 53.049 | 2002 | 52.682 | 2001 | 52.314 | 2000 | 51.947 | 1999 | 51.578 | 1998 | 51.21 | 1997 | 50.841 | 1996 | 50.473 | 1995 | 50.104 | 1994 | 49.764 | 1993 | 49.555 | 1992 | 49.347 | 1991 | 49.139 | 1990 | 48.931 | 1989 | 48.723 | 1988 | 48.515 | 1987 | 48.307 | 1986 | 48.099 | 1985 | 47.891 | 1984 | 47.684 | 1983 | 47.476 | 1982 | 47.268 | 1981 | 47.038 | 1980 | 46.708 | 1979 | 46.377 | 1978 | 46.048 | 1977 | 45.718 | 1976 | 45.39 | 1975 | 45.061 | 1974 | 44.733 | 1973 | 44.405 | 1972 | 44.078 | 1971 | 43.751 | 1970 | 43.345 | 1969 | 42.671 | 1968 | 42.001 | 1967 | 41.332 | 1966 | 40.667 | 1965 | 40.006 | 1964 | 39.349 | 1963 | 38.694 | 1962 | 38.044 | 1961 | 37.399 | 1960 | 36.807 |
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