Year | Value | 2021 | 21.071 | 2020 | 21.353 | 2019 | 21.628 | 2018 | 21.895 | 2017 | 22.16 | 2016 | 22.44 | 2015 | 22.751 | 2014 | 23.123 | 2013 | 23.569 | 2012 | 24.111 | 2011 | 24.717 | 2010 | 25.392 | 2009 | 26.112 | 2008 | 26.871 | 2007 | 27.64 | 2006 | 28.479 | 2005 | 29.314 | 2004 | 30.188 | 2003 | 31.101 | 2002 | 32.052 | 2001 | 32.986 | 2000 | 33.841 | 1999 | 34.561 | 1998 | 35.023 | 1997 | 35.274 | 1996 | 35.757 | 1995 | 36.215 | 1994 | 36.779 | 1993 | 37.211 | 1992 | 37.47 | 1991 | 37.72 | 1990 | 38.032 | 1989 | 38.361 | 1988 | 38.698 | 1987 | 39.192 | 1986 | 39.742 | 1985 | 40.283 | 1984 | 40.883 | 1983 | 41.633 | 1982 | 42.206 | 1981 | 42.869 | 1980 | 43.445 | 1979 | 43.968 | 1978 | 44.344 | 1977 | 44.738 | 1976 | 45.204 | 1975 | 45.429 | 1974 | 45.522 | 1973 | 45.798 | 1972 | 46.051 | 1971 | 46.093 | 1970 | 46.13 | 1969 | 46.31 | 1968 | 46.554 | 1967 | 46.763 | 1966 | 47.203 | 1965 | 47.721 | 1964 | 47.965 | 1963 | 48.277 | 1962 | 48.666 | 1961 | 49.134 | 1960 | 49.579 |
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