Year | Value | 2021 | 20.402 | 2020 | 20.64 | 2019 | 20.868 | 2018 | 21.026 | 2017 | 21.376 | 2016 | 21.764 | 2015 | 22.05 | 2014 | 22.22 | 2013 | 22.247 | 2012 | 22.335 | 2011 | 22.372 | 2010 | 22.589 | 2009 | 23 | 2008 | 23.552 | 2007 | 24.194 | 2006 | 24.982 | 2005 | 26.033 | 2004 | 27.071 | 2003 | 27.879 | 2002 | 28.487 | 2001 | 29.522 | 2000 | 30.614 | 1999 | 31.391 | 1998 | 32.323 | 1997 | 33.163 | 1996 | 34.457 | 1995 | 35.642 | 1994 | 36.44 | 1993 | 37.147 | 1992 | 37.147 | 1991 | 37.608 | 1990 | 38.114 | 1989 | 38.348 | 1988 | 38.736 | 1987 | 39.017 | 1986 | 39.277 | 1985 | 39.599 | 1984 | 40.016 | 1983 | 40.114 | 1982 | 40.228 | 1981 | 40.355 | 1980 | 40.532 | 1979 | 41.017 | 1978 | 41.225 | 1977 | 41.32 | 1976 | 41.571 | 1975 | 41.576 | 1974 | 41.704 | 1973 | 41.571 | 1972 | 42.177 | 1971 | 42.691 | 1970 | 42.98 | 1969 | 43.282 | 1968 | 43.723 | 1967 | 43.82 | 1966 | 44.036 | 1965 | 44.313 | 1964 | 44.685 | 1963 | 44.816 | 1962 | 45.033 | 1961 | 45.131 | 1960 | 45.054 |
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