Year | Value | 2022 | 56.827 | 2021 | 57.002 | 2020 | 57.151 | 2019 | 57.274 | 2018 | 57.371 | 2017 | 57.443 | 2016 | 57.489 | 2015 | 57.51 | 2014 | 57.504 | 2013 | 57.473 | 2012 | 57.442 | 2011 | 57.411 | 2010 | 57.38 | 2009 | 57.349 | 2008 | 57.318 | 2007 | 57.287 | 2006 | 57.256 | 2005 | 57.225 | 2004 | 57.01 | 2003 | 56.611 | 2002 | 56.211 | 2001 | 55.811 | 2000 | 55.411 | 1999 | 55.008 | 1998 | 54.606 | 1997 | 54.203 | 1996 | 53.8 | 1995 | 53.706 | 1994 | 53.613 | 1993 | 53.519 | 1992 | 53.425 | 1991 | 53.331 | 1990 | 53.238 | 1989 | 53.144 | 1988 | 53.512 | 1987 | 54.286 | 1986 | 55.056 | 1985 | 55.824 | 1984 | 56.588 | 1983 | 57.351 | 1982 | 58.109 | 1981 | 58.864 | 1980 | 59.613 | 1979 | 60.36 | 1978 | 61.178 | 1977 | 62.052 | 1976 | 62.918 | 1975 | 63.778 | 1974 | 64.628 | 1973 | 65.469 | 1972 | 66.299 | 1971 | 67.121 | 1970 | 67.932 | 1969 | 68.811 | 1968 | 69.74 | 1967 | 70.655 | 1966 | 71.553 | 1965 | 72.434 | 1964 | 73.297 | 1963 | 74.144 | 1962 | 74.973 | 1961 | 75.784 | 1960 | 76.576 |
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