Year | Value | 2022 | 57.008 | 2021 | 56.652 | 2020 | 56.311 | 2019 | 55.985 | 2018 | 55.674 | 2017 | 55.378 | 2016 | 55.098 | 2015 | 54.833 | 2014 | 54.584 | 2013 | 54.35 | 2012 | 54.132 | 2011 | 53.93 | 2010 | 53.743 | 2009 | 53.557 | 2008 | 53.371 | 2007 | 53.184 | 2006 | 52.998 | 2005 | 52.811 | 2004 | 52.625 | 2003 | 52.437 | 2002 | 52.251 | 2001 | 52.053 | 2000 | 51.814 | 1999 | 51.574 | 1998 | 51.335 | 1997 | 51.095 | 1996 | 50.855 | 1995 | 50.615 | 1994 | 50.375 | 1993 | 50.136 | 1992 | 49.896 | 1991 | 49.656 | 1990 | 49.444 | 1989 | 49.24 | 1988 | 49.036 | 1987 | 48.832 | 1986 | 48.628 | 1985 | 48.424 | 1984 | 48.22 | 1983 | 48.016 | 1982 | 47.813 | 1981 | 47.286 | 1980 | 46.739 | 1979 | 46.191 | 1978 | 45.645 | 1977 | 45.1 | 1976 | 44.557 | 1975 | 44.013 | 1974 | 43.472 | 1973 | 42.933 | 1972 | 42.395 | 1971 | 41.858 | 1970 | 41.324 | 1969 | 40.596 | 1968 | 39.815 | 1967 | 39.036 | 1966 | 38.265 | 1965 | 37.499 | 1964 | 36.74 | 1963 | 35.985 | 1962 | 35.239 | 1961 | 34.5 | 1960 | 33.769 |
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