Year | Value | 2021 | 10.922501223931 | 2020 | 10.905120503248 | 2019 | 10.911463754842 | 2018 | 10.917192007237 | 2017 | 10.916172828379 | 2016 | 10.927440064592 | 2015 | 10.944426186614 | 2014 | 10.939665533912 | 2013 | 10.926012295028 | 2012 | 10.915588381771 | 2011 | 10.924717983006 | 2010 | 10.934940592265 | 2009 | 10.969009992944 | 2008 | 10.970299416099 | 2007 | 10.978436505943 | 2006 | 11.061491473469 | 2005 | 11.027144742396 | 2004 | 11.071917362049 | 2003 | 11.101309964721 | 2002 | 11.194412890372 | 2001 | 11.286025724979 | 2000 | 11.37530613083 | 1999 | 11.520233633385 | 1998 | 11.586752470279 | 1997 | 11.692366654323 | 1996 | 11.66087143494 | 1995 | 11.810910076396 | 1994 | 11.852058076617 | 1993 | 11.897153669329 | 1992 | 12.00617414074 | 1991 | 36.643088242426 | 1990 | 36.665973810019 | 1989 | 36.847502251784 | 1988 | 37.24113578298 | 1987 | 37.346377805011 | 1986 | 37.011265050648 | 1985 | 37.035498410984 | 1984 | 36.951027840669 | 1983 | 36.332730961234 | 1982 | 36.668536097321 | 1981 | 37.565862811485 | 1980 | 37.541629451149 | 1979 | 37.891974603438 | 1978 | 37.488316058409 | 1977 | 37.457851262558 | 1976 | 37.31937491778 | 1975 | 37.353994003974 | 1974 | 37.58455711803 | 1973 | 37.851816463453 | 1972 | 37.941133705835 | 1971 | 37.629561930083 | 1970 | 37.580402827687 | 1969 | 37.924516544461 | 1968 | 37.255675799182 | 1967 | 37.083965131656 | 1966 | 37.301372992958 | 1965 | 37.194053825755 | 1964 | 37.371303547072 | 1963 | 37.429463611878 | 1962 | 37.023035539954 | 1961 | 37.03826793788 |
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