Year | Value | 2022 | 53.956 | 2021 | 53.005 | 2020 | 52.033 | 2019 | 51.042 | 2018 | 50.032 | 2017 | 49.005 | 2016 | 47.961 | 2015 | 46.9 | 2014 | 45.826 | 2013 | 44.756 | 2012 | 43.693 | 2011 | 42.637 | 2010 | 41.616 | 2009 | 40.601 | 2008 | 39.597 | 2007 | 38.598 | 2006 | 37.61 | 2005 | 36.632 | 2004 | 35.666 | 2003 | 34.709 | 2002 | 33.766 | 2001 | 32.898 | 2000 | 32.373 | 1999 | 31.851 | 1998 | 31.335 | 1997 | 30.823 | 1996 | 30.316 | 1995 | 29.813 | 1994 | 29.316 | 1993 | 28.823 | 1992 | 28.336 | 1991 | 27.919 | 1990 | 27.656 | 1989 | 27.395 | 1988 | 27.136 | 1987 | 26.877 | 1986 | 26.621 | 1985 | 26.366 | 1984 | 26.113 | 1983 | 25.861 | 1982 | 25.611 | 1981 | 25.355 | 1980 | 25.066 | 1979 | 24.778 | 1978 | 24.493 | 1977 | 24.21 | 1976 | 23.929 | 1975 | 23.651 | 1974 | 23.374 | 1973 | 23.1 | 1972 | 22.829 | 1971 | 22.559 | 1970 | 22.292 | 1969 | 21.852 | 1968 | 21.387 | 1967 | 20.929 | 1966 | 20.478 | 1965 | 20.035 | 1964 | 19.6 | 1963 | 19.17 | 1962 | 18.748 | 1961 | 18.334 | 1960 | 17.909 |
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