Year | Value | 2021 | 61.248 | 2020 | 63.678 | 2019 | 64.353 | 2018 | 63.169 | 2017 | 61.543 | 2016 | 60.031 | 2015 | 58.128 | 2014 | 55.917 | 2013 | 53.985 | 2012 | 52.02 | 2011 | 50.181 | 2010 | 48.306 | 2009 | 45.659 | 2008 | 45.72 | 2007 | 45.163 | 2006 | 44.666 | 2005 | 43.356 | 2004 | 43.95 | 2003 | 44.972 | 2002 | 46.616 | 2001 | 48.132 | 2000 | 49.317 | 1999 | 51.193 | 1998 | 53.136 | 1997 | 54.843 | 1996 | 56.704 | 1995 | 59.149 | 1994 | 61.151 | 1993 | 62.896 | 1992 | 64.157 | 1991 | 64.868 | 1990 | 65.064 | 1989 | 64.657 | 1988 | 64.453 | 1987 | 63.72 | 1986 | 63.093 | 1985 | 62.445 | 1984 | 61.657 | 1983 | 59.844 | 1982 | 60.762 | 1981 | 60.086 | 1980 | 59.523 | 1979 | 58.956 | 1978 | 58.114 | 1977 | 57.213 | 1976 | 56.139 | 1975 | 55.259 | 1974 | 54.541 | 1973 | 53.957 | 1972 | 53.423 | 1971 | 53.013 | 1970 | 52.531 | 1969 | 52.038 | 1968 | 51.382 | 1967 | 50.736 | 1966 | 50.168 | 1965 | 49.462 | 1964 | 48.824 | 1963 | 48.354 | 1962 | 48.169 | 1961 | 47.713 | 1960 | 47.327 |
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