Year | Value | 2022 | 53.875 | 2021 | 53.452 | 2020 | 53.032 | 2019 | 52.614 | 2018 | 52.198 | 2017 | 51.784 | 2016 | 51.373 | 2015 | 50.964 | 2014 | 50.558 | 2013 | 50.154 | 2012 | 49.754 | 2011 | 49.356 | 2010 | 48.961 | 2009 | 48.569 | 2008 | 48.18 | 2007 | 47.794 | 2006 | 47.412 | 2005 | 47.032 | 2004 | 46.656 | 2003 | 46.283 | 2002 | 45.914 | 2001 | 45.548 | 2000 | 45.186 | 1999 | 44.823 | 1998 | 44.461 | 1997 | 44.1 | 1996 | 43.741 | 1995 | 43.38 | 1994 | 43.021 | 1993 | 42.663 | 1992 | 42.306 | 1991 | 41.949 | 1990 | 41.409 | 1989 | 40.843 | 1988 | 40.28 | 1987 | 39.717 | 1986 | 39.158 | 1985 | 38.602 | 1984 | 38.05 | 1983 | 37.5 | 1982 | 36.953 | 1981 | 36.409 | 1980 | 35.87 | 1979 | 35.333 | 1978 | 34.8 | 1977 | 34.271 | 1976 | 33.747 | 1975 | 33.225 | 1974 | 32.708 | 1973 | 32.195 | 1972 | 31.687 | 1971 | 31.182 | 1970 | 30.683 | 1969 | 30.187 | 1968 | 29.697 | 1967 | 29.21 | 1966 | 28.729 | 1965 | 28.252 | 1964 | 27.781 | 1963 | 27.314 | 1962 | 26.851 | 1961 | 26.394 | 1960 | 25.943 |
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