Year | Value | 2021 | 76.696 | 2020 | 77.883 | 2019 | 78.797 | 2018 | 78.129 | 2017 | 78.17 | 2016 | 79.584 | 2015 | 80.616 | 2014 | 80.514 | 2013 | 78.188 | 2012 | 77.052 | 2011 | 77.115 | 2010 | 77.989 | 2009 | 78.065 | 2008 | 78.141 | 2007 | 77.835 | 2006 | 78.105 | 2005 | 77.727 | 2004 | 76.478 | 2003 | 76.388 | 2002 | 77.085 | 2001 | 76.773 | 2000 | 76.773 | 1999 | 77.269 | 1998 | 75.743 | 1997 | 76.027 | 1996 | 75.135 | 1995 | 74.719 | 1994 | 74.662 | 1993 | 74.614 | 1992 | 74.804 | 1991 | 74.331 | 1990 | 74.465 | 1989 | 74.233 | 1988 | 74.606 | 1987 | 74.255 | 1986 | 74.408 | 1985 | 74.234 | 1984 | 74.305 | 1983 | 74.559 | 1982 | 74.539 | 1981 | 73.492 | 1980 | 72.998 | 1979 | 73.287 | 1978 | 73.126 | 1977 | 73.434 | 1976 | 73.938 | 1975 | 73.957 | 1974 | 73.741 | 1973 | 73.469 | 1972 | 73.057 | 1971 | 72.096 | 1970 | 73.058 | 1969 | 72.353 | 1968 | 71.185 | 1967 | 71.168 | 1966 | 69.863 | 1965 | 67.768 | 1964 | 69.398 | 1963 | 69.508 | 1962 | 67.415 | 1961 | 67.168 | 1960 | 67.745 |
|