Year | Value | 2021 | 62.432 | 2020 | 64.16 | 2019 | 63.92 | 2018 | 63.234 | 2017 | 62.221 | 2016 | 61.475 | 2015 | 60.44 | 2014 | 59.439 | 2013 | 58.523 | 2012 | 57.521 | 2011 | 56.584 | 2010 | 55.837 | 2009 | 55.282 | 2008 | 54.692 | 2007 | 53.993 | 2006 | 53.273 | 2005 | 52.89 | 2004 | 52.636 | 2003 | 52.305 | 2002 | 52.181 | 2001 | 51.602 | 2000 | 51.11 | 1999 | 50.407 | 1998 | 49.607 | 1997 | 48.999 | 1996 | 48.142 | 1995 | 47.579 | 1994 | 47.134 | 1993 | 47.013 | 1992 | 46.721 | 1991 | 46.472 | 1990 | 46.264 | 1989 | 45.951 | 1988 | 45.678 | 1987 | 45.104 | 1986 | 44.833 | 1985 | 42.535 | 1984 | 42.21 | 1983 | 42.275 | 1982 | 42.169 | 1981 | 41.961 | 1980 | 44.153 | 1979 | 44.044 | 1978 | 44.084 | 1977 | 43.989 | 1976 | 43.878 | 1975 | 43.785 | 1974 | 43.494 | 1973 | 43.429 | 1972 | 43.357 | 1971 | 43.233 | 1970 | 43.238 | 1969 | 43.176 | 1968 | 43.162 | 1967 | 43.156 | 1966 | 43.157 | 1965 | 43.119 | 1964 | 43.09 | 1963 | 43.075 | 1962 | 42.986 | 1961 | 42.783 | 1960 | 42.371 |
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