Year | Value | 2022 | 35.817 | 2021 | 36.088 | 2020 | 36.347 | 2019 | 36.595 | 2018 | 36.83 | 2017 | 37.053 | 2016 | 37.263 | 2015 | 37.462 | 2014 | 37.66 | 2013 | 37.859 | 2012 | 38.058 | 2011 | 38.258 | 2010 | 38.458 | 2009 | 38.658 | 2008 | 38.859 | 2007 | 39.06 | 2006 | 39.262 | 2005 | 39.523 | 2004 | 39.798 | 2003 | 40.075 | 2002 | 40.351 | 2001 | 40.601 | 2000 | 40.845 | 1999 | 41.09 | 1998 | 41.336 | 1997 | 41.581 | 1996 | 41.827 | 1995 | 42.051 | 1994 | 42.269 | 1993 | 42.488 | 1992 | 42.707 | 1991 | 42.927 | 1990 | 43.071 | 1989 | 43.196 | 1988 | 43.322 | 1987 | 43.447 | 1986 | 43.573 | 1985 | 43.725 | 1984 | 43.885 | 1983 | 44.045 | 1982 | 44.206 | 1981 | 44.366 | 1980 | 44.667 | 1979 | 45.006 | 1978 | 45.345 | 1977 | 45.685 | 1976 | 46.025 | 1975 | 46.366 | 1974 | 46.706 | 1973 | 47.048 | 1972 | 47.389 | 1971 | 47.731 | 1970 | 48.724 | 1969 | 49.885 | 1968 | 51.044 | 1967 | 52.205 | 1966 | 53.363 | 1965 | 53.767 | 1964 | 53.977 | 1963 | 54.187 | 1962 | 54.397 | 1961 | 54.607 | 1960 | 54.816 |
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