Year | Value | 2022 | 56.923 | 2021 | 56.133 | 2020 | 55.327 | 2019 | 54.507 | 2018 | 53.672 | 2017 | 52.824 | 2016 | 51.962 | 2015 | 51.089 | 2014 | 50.203 | 2013 | 49.306 | 2012 | 48.4 | 2011 | 47.493 | 2010 | 46.588 | 2009 | 45.686 | 2008 | 44.788 | 2007 | 43.89 | 2006 | 42.998 | 2005 | 42.111 | 2004 | 41.229 | 2003 | 40.351 | 2002 | 39.48 | 2001 | 38.616 | 2000 | 38.091 | 1999 | 38.214 | 1998 | 38.337 | 1997 | 38.459 | 1996 | 38.582 | 1995 | 38.705 | 1994 | 38.829 | 1993 | 38.952 | 1992 | 39.075 | 1991 | 39.199 | 1990 | 39.323 | 1989 | 39.447 | 1988 | 39.57 | 1987 | 38.305 | 1986 | 36.634 | 1985 | 34.994 | 1984 | 33.391 | 1983 | 31.822 | 1982 | 30.295 | 1981 | 28.81 | 1980 | 27.371 | 1979 | 25.975 | 1978 | 24.627 | 1977 | 23.327 | 1976 | 21.971 | 1975 | 20.569 | 1974 | 19.237 | 1973 | 17.971 | 1972 | 16.773 | 1971 | 15.636 | 1970 | 14.564 | 1969 | 13.554 | 1968 | 12.606 | 1967 | 11.712 | 1966 | 10.874 | 1965 | 10.09 | 1964 | 9.357 | 1963 | 8.671 | 1962 | 8.031 | 1961 | 7.435 | 1960 | 6.88 |
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