Year | Value | 2021 | 62.234 | 2020 | 62.891 | 2019 | 63.662 | 2018 | 63.2 | 2017 | 63.038 | 2016 | 62.952 | 2015 | 62.416 | 2014 | 62.25 | 2013 | 61.811 | 2012 | 61.695 | 2011 | 61.642 | 2010 | 61.209 | 2009 | 61.119 | 2008 | 60.641 | 2007 | 60.184 | 2006 | 59.96 | 2005 | 59.3 | 2004 | 58.818 | 2003 | 58.462 | 2002 | 57.946 | 2001 | 57.711 | 2000 | 56.984 | 1999 | 56.29 | 1998 | 55.61 | 1997 | 54.808 | 1996 | 53.876 | 1995 | 53.406 | 1994 | 53.002 | 1993 | 52.535 | 1992 | 51.712 | 1991 | 51.039 | 1990 | 50.387 | 1989 | 49.839 | 1988 | 49.298 | 1987 | 48.924 | 1986 | 48.609 | 1985 | 48.438 | 1984 | 48.361 | 1983 | 48.387 | 1982 | 48.47 | 1981 | 48.58 | 1980 | 48.695 | 1979 | 48.754 | 1978 | 48.745 | 1977 | 48.759 | 1976 | 48.735 | 1975 | 48.66 | 1974 | 48.404 | 1973 | 48.064 | 1972 | 47.59 | 1971 | 47.034 | 1970 | 46.711 | 1969 | 46.137 | 1968 | 45.61 | 1967 | 45.178 | 1966 | 44.677 | 1965 | 44.309 | 1964 | 43.973 | 1963 | 43.505 | 1962 | 43.098 | 1961 | 42.661 | 1960 | 42.237 |
|