Year | Value | 2021 | 61.445 | 2020 | 61.485 | 2019 | 61.858 | 2018 | 61.354 | 2017 | 61.199 | 2016 | 60.731 | 2015 | 60.682 | 2014 | 60.265 | 2013 | 60.213 | 2012 | 59.775 | 2011 | 59.733 | 2010 | 59.68 | 2009 | 59.311 | 2008 | 59.24 | 2007 | 58.93 | 2006 | 58.836 | 2005 | 58.504 | 2004 | 58.05 | 2003 | 58.164 | 2002 | 58.002 | 2001 | 58.349 | 2000 | 58.428 | 1999 | 58.347 | 1998 | 58.024 | 1997 | 57.587 | 1996 | 57.085 | 1995 | 57.14 | 1994 | 57.08 | 1993 | 56.932 | 1992 | 56.761 | 1991 | 56.378 | 1990 | 56.013 | 1989 | 55.383 | 1988 | 54.967 | 1987 | 54.561 | 1986 | 53.913 | 1985 | 53.205 | 1984 | 52.703 | 1983 | 52.085 | 1982 | 51.314 | 1981 | 50.7 | 1980 | 50.197 | 1979 | 49.58 | 1978 | 48.954 | 1977 | 47.839 | 1976 | 46.929 | 1975 | 46.028 | 1974 | 45.288 | 1973 | 44.762 | 1972 | 44.239 | 1971 | 43.639 | 1970 | 43.166 | 1969 | 42.788 | 1968 | 42.573 | 1967 | 42.027 | 1966 | 41.605 | 1965 | 41.074 | 1964 | 40.58 | 1963 | 40.217 | 1962 | 39.729 | 1961 | 39.338 | 1960 | 38.971 |
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