Year | Value | 2022 | 39.866 | 2021 | 39.925 | 2020 | 39.957 | 2019 | 39.963 | 2018 | 39.942 | 2017 | 39.895 | 2016 | 39.822 | 2015 | 39.722 | 2014 | 39.597 | 2013 | 39.471 | 2012 | 39.346 | 2011 | 39.22 | 2010 | 39.108 | 2009 | 38.996 | 2008 | 38.884 | 2007 | 38.771 | 2006 | 38.659 | 2005 | 38.548 | 2004 | 38.436 | 2003 | 38.324 | 2002 | 38.213 | 2001 | 38.239 | 2000 | 38.284 | 1999 | 38.328 | 1998 | 38.373 | 1997 | 38.417 | 1996 | 38.462 | 1995 | 38.507 | 1994 | 38.551 | 1993 | 38.596 | 1992 | 38.641 | 1991 | 38.685 | 1990 | 38.73 | 1989 | 38.775 | 1988 | 38.957 | 1987 | 39.324 | 1986 | 39.69 | 1985 | 40.058 | 1984 | 40.427 | 1983 | 40.798 | 1982 | 41.169 | 1981 | 41.541 | 1980 | 41.914 | 1979 | 42.288 | 1978 | 42.78 | 1977 | 43.425 | 1976 | 44.071 | 1975 | 44.72 | 1974 | 45.371 | 1973 | 46.023 | 1972 | 46.676 | 1971 | 47.332 | 1970 | 47.875 | 1969 | 48.274 | 1968 | 48.674 | 1967 | 49.074 | 1966 | 49.474 | 1965 | 49.874 | 1964 | 50.273 | 1963 | 50.674 | 1962 | 51.074 | 1961 | 51.473 | 1960 | 52.108 |
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