Year | Value | 2022 | 58.82 | 2021 | 57.964 | 2020 | 57.088 | 2019 | 56.192 | 2018 | 55.278 | 2017 | 54.346 | 2016 | 53.396 | 2015 | 52.427 | 2014 | 51.444 | 2013 | 50.46 | 2012 | 49.477 | 2011 | 48.492 | 2010 | 47.509 | 2009 | 46.528 | 2008 | 45.551 | 2007 | 44.574 | 2006 | 43.604 | 2005 | 42.638 | 2004 | 41.679 | 2003 | 40.645 | 2002 | 38.935 | 2001 | 37.251 | 2000 | 35.6 | 1999 | 34.992 | 1998 | 34.389 | 1997 | 33.792 | 1996 | 33.2 | 1995 | 32.59 | 1994 | 31.987 | 1993 | 31.39 | 1992 | 30.8 | 1991 | 29.641 | 1990 | 28.51 | 1989 | 27.405 | 1988 | 26.329 | 1987 | 25.277 | 1986 | 24.255 | 1985 | 23.261 | 1984 | 22.297 | 1983 | 21.36 | 1982 | 20.595 | 1981 | 20.568 | 1980 | 20.541 | 1979 | 20.513 | 1978 | 20.486 | 1977 | 20.459 | 1976 | 20.431 | 1975 | 20.404 | 1974 | 20.377 | 1973 | 20.35 | 1972 | 20.323 | 1971 | 20.222 | 1970 | 19.762 | 1969 | 19.31 | 1968 | 18.866 | 1967 | 18.429 | 1966 | 18.001 | 1965 | 17.58 | 1964 | 17.168 | 1963 | 16.762 | 1962 | 16.365 | 1961 | 15.975 | 1960 | 15.593 |
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