Year | Value | 2022 | 58.396 | 2021 | 57.972 | 2020 | 57.546 | 2019 | 57.119 | 2018 | 56.691 | 2017 | 56.261 | 2016 | 55.831 | 2015 | 55.4 | 2014 | 54.969 | 2013 | 54.537 | 2012 | 54.12 | 2011 | 53.72 | 2010 | 53.336 | 2009 | 52.969 | 2008 | 52.619 | 2007 | 52.285 | 2006 | 51.969 | 2005 | 51.67 | 2004 | 51.388 | 2003 | 51.123 | 2002 | 50.876 | 2001 | 50.646 | 2000 | 50.433 | 1999 | 50.238 | 1998 | 50.061 | 1997 | 49.901 | 1996 | 49.758 | 1995 | 49.633 | 1994 | 49.525 | 1993 | 49.435 | 1992 | 49.362 | 1991 | 49.307 | 1990 | 49.27 | 1989 | 49.25 | 1988 | 49.247 | 1987 | 49.262 | 1986 | 49.277 | 1985 | 49.292 | 1984 | 49.307 | 1983 | 49.322 | 1982 | 49.337 | 1981 | 49.352 | 1980 | 49.366 | 1979 | 49.381 | 1978 | 49.396 | 1977 | 49.282 | 1976 | 47.774 | 1975 | 46.266 | 1974 | 44.767 | 1973 | 43.277 | 1972 | 41.802 | 1971 | 40.337 | 1970 | 39.068 | 1969 | 37.846 | 1968 | 36.641 | 1967 | 35.449 | 1966 | 34.277 | 1965 | 33.123 | 1964 | 31.991 | 1963 | 30.877 | 1962 | 29.786 | 1961 | 28.717 | 1960 | 27.673 |
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