Year | Value | 2021 | 67.879 | 2020 | 68.208 | 2019 | 68.388 | 2018 | 68.233 | 2017 | 68.018 | 2016 | 67.432 | 2015 | 67.349 | 2014 | 67.233 | 2013 | 66.597 | 2012 | 66.447 | 2011 | 65.801 | 2010 | 65.506 | 2009 | 65.321 | 2008 | 63.96 | 2007 | 64.052 | 2006 | 63.021 | 2005 | 61.022 | 2004 | 60.569 | 2003 | 61.517 | 2002 | 61.985 | 2001 | 61.629 | 2000 | 61.271 | 1999 | 60.106 | 1998 | 54.266 | 1997 | 57.07 | 1996 | 56.489 | 1995 | 56.151 | 1994 | 59.14 | 1993 | 51.98 | 1992 | 51.397 | 1991 | 54.563 | 1990 | 54.143 | 1989 | 53.726 | 1988 | 43.163 | 1987 | 49.261 | 1986 | 54.919 | 1985 | 49.516 | 1984 | 49.235 | 1983 | 49.927 | 1982 | 56.006 | 1981 | 55.835 | 1980 | 55.606 | 1979 | 54.878 | 1978 | 54.721 | 1977 | 55.176 | 1976 | 55.031 | 1975 | 54.885 | 1974 | 54.77 | 1973 | 54.592 | 1972 | 52.163 | 1971 | 52.153 | 1970 | 48.177 | 1969 | 47.797 | 1968 | 47.891 | 1967 | 47.485 | 1966 | 47.063 | 1965 | 49.104 | 1964 | 51.319 | 1963 | 48.409 | 1962 | 48.331 | 1961 | 47.917 | 1960 | 47.501 |
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