Year | Value | 2021 | 59.253 | 2020 | 61.124 | 2019 | 61.292 | 2018 | 61.414 | 2017 | 60.709 | 2016 | 60.306 | 2015 | 59.591 | 2014 | 58.846 | 2013 | 57.458 | 2012 | 55.626 | 2011 | 53.347 | 2010 | 50.652 | 2009 | 48.063 | 2008 | 46.723 | 2007 | 45.61 | 2006 | 45.364 | 2005 | 44.768 | 2004 | 44.502 | 2003 | 43.393 | 2002 | 44.565 | 2001 | 41.957 | 2000 | 44.686 | 1999 | 45.206 | 1998 | 46.819 | 1997 | 47.993 | 1996 | 48.955 | 1995 | 50.531 | 1994 | 52.588 | 1993 | 54.426 | 1992 | 56.435 | 1991 | 58.091 | 1990 | 59.426 | 1989 | 60.401 | 1988 | 61.323 | 1987 | 61.767 | 1986 | 62.023 | 1985 | 61.624 | 1984 | 61.051 | 1983 | 60.248 | 1982 | 59.875 | 1981 | 59.327 | 1980 | 58.674 | 1979 | 55.038 | 1978 | 54.593 | 1977 | 56.285 | 1976 | 56.936 | 1975 | 57.552 | 1974 | 57.494 | 1973 | 57.367 | 1972 | 57.401 | 1971 | 57.196 | 1970 | 57.032 | 1969 | 56.714 | 1968 | 56.455 | 1967 | 56.188 | 1966 | 55.889 | 1965 | 55.459 | 1964 | 54.994 | 1963 | 54.549 | 1962 | 54.071 | 1961 | 53.619 | 1960 | 53.235 |
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