Year | Value | 2022 | 19.643 | 2021 | 19.962 | 2020 | 20.285 | 2019 | 20.612 | 2018 | 20.942 | 2017 | 21.276 | 2016 | 21.613 | 2015 | 21.954 | 2014 | 22.298 | 2013 | 22.645 | 2012 | 22.996 | 2011 | 23.351 | 2010 | 23.708 | 2009 | 24.068 | 2008 | 24.432 | 2007 | 24.801 | 2006 | 25.173 | 2005 | 25.548 | 2004 | 25.927 | 2003 | 26.311 | 2002 | 26.697 | 2001 | 27.087 | 2000 | 27.284 | 1999 | 27.403 | 1998 | 27.522 | 1997 | 27.642 | 1996 | 27.761 | 1995 | 27.881 | 1994 | 28.002 | 1993 | 28.122 | 1992 | 28.243 | 1991 | 28.365 | 1990 | 28.533 | 1989 | 28.721 | 1988 | 28.91 | 1987 | 29.1 | 1986 | 29.291 | 1985 | 29.482 | 1984 | 29.673 | 1983 | 29.866 | 1982 | 30.06 | 1981 | 30.254 | 1980 | 30.657 | 1979 | 31.13 | 1978 | 31.607 | 1977 | 32.088 | 1976 | 32.571 | 1975 | 33.06 | 1974 | 33.552 | 1973 | 34.048 | 1972 | 34.546 | 1971 | 35.049 | 1970 | 35.78 | 1969 | 36.615 | 1968 | 37.457 | 1967 | 38.309 | 1966 | 39.167 | 1965 | 40.031 | 1964 | 40.901 | 1963 | 41.778 | 1962 | 42.66 | 1961 | 43.547 | 1960 | 44.064 |
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