Year | Value | 2022 | 50.914 | 2021 | 51.4 | 2020 | 51.878 | 2019 | 52.347 | 2018 | 52.808 | 2017 | 53.26 | 2016 | 53.704 | 2015 | 54.138 | 2014 | 54.564 | 2013 | 54.981 | 2012 | 55.397 | 2011 | 55.812 | 2010 | 56.227 | 2009 | 56.641 | 2008 | 57.053 | 2007 | 57.465 | 2006 | 57.876 | 2005 | 58.286 | 2004 | 58.694 | 2003 | 59.102 | 2002 | 59.393 | 2001 | 59.536 | 2000 | 59.68 | 1999 | 59.823 | 1998 | 59.966 | 1997 | 60.109 | 1996 | 60.251 | 1995 | 60.394 | 1994 | 60.536 | 1993 | 60.679 | 1992 | 60.82 | 1991 | 60.962 | 1990 | 61.104 | 1989 | 61.245 | 1988 | 61.387 | 1987 | 61.729 | 1986 | 62.091 | 1985 | 62.451 | 1984 | 62.809 | 1983 | 63.168 | 1982 | 63.524 | 1981 | 63.878 | 1980 | 64.231 | 1979 | 64.583 | 1978 | 64.933 | 1977 | 65.282 | 1976 | 65.628 | 1975 | 66.307 | 1974 | 67.063 | 1973 | 67.811 | 1972 | 68.549 | 1971 | 69.28 | 1970 | 70 | 1969 | 70.753 | 1968 | 71.493 | 1967 | 72.224 | 1966 | 72.943 | 1965 | 73.649 | 1964 | 74.343 | 1963 | 75.027 | 1962 | 75.697 | 1961 | 76.355 | 1960 | 77 |
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