Year | Value | 2022 | 63.56 | 2021 | 62.512 | 2020 | 61.428 | 2019 | 60.308 | 2018 | 59.152 | 2017 | 57.96 | 2016 | 56.736 | 2015 | 55.5 | 2014 | 54.259 | 2013 | 53.013 | 2012 | 51.765 | 2011 | 50.511 | 2010 | 49.226 | 2009 | 47.88 | 2008 | 46.539 | 2007 | 45.199 | 2006 | 43.868 | 2005 | 42.522 | 2004 | 41.144 | 2003 | 39.776 | 2002 | 38.425 | 2001 | 37.093 | 2000 | 35.877 | 1999 | 34.865 | 1998 | 33.867 | 1997 | 32.883 | 1996 | 31.916 | 1995 | 30.961 | 1994 | 30.024 | 1993 | 29.103 | 1992 | 28.2 | 1991 | 27.312 | 1990 | 26.442 | 1989 | 25.701 | 1988 | 24.974 | 1987 | 24.259 | 1986 | 23.559 | 1985 | 22.874 | 1984 | 22.203 | 1983 | 21.545 | 1982 | 20.902 | 1981 | 20.118 | 1980 | 19.358 | 1979 | 18.617 | 1978 | 17.9 | 1977 | 17.52 | 1976 | 17.46 | 1975 | 17.4 | 1974 | 17.292 | 1973 | 17.184 | 1972 | 17.184 | 1971 | 17.292 | 1970 | 17.4 | 1969 | 17.528 | 1968 | 17.656 | 1967 | 17.785 | 1966 | 17.915 | 1965 | 18.086 | 1964 | 18.299 | 1963 | 17.757 | 1962 | 17.226 | 1961 | 16.708 | 1960 | 16.203 |
|