Year | Value | 2021 | 62.726 | 2020 | 62.943 | 2019 | 63.54 | 2018 | 63.042 | 2017 | 62.832 | 2016 | 62.332 | 2015 | 62.054 | 2014 | 61.452 | 2013 | 60.986 | 2012 | 60.647 | 2011 | 60.172 | 2010 | 59.583 | 2009 | 59.101 | 2008 | 58.772 | 2007 | 58.205 | 2006 | 57.683 | 2005 | 57.078 | 2004 | 56.638 | 2003 | 56.188 | 2002 | 55.731 | 2001 | 55.27 | 2000 | 54.936 | 1999 | 54.414 | 1998 | 53.948 | 1997 | 53.675 | 1996 | 53.331 | 1995 | 53.178 | 1994 | 52.956 | 1993 | 52.872 | 1992 | 52.698 | 1991 | 52.516 | 1990 | 52.417 | 1989 | 52.309 | 1988 | 52.123 | 1987 | 51.837 | 1986 | 51.646 | 1985 | 51.271 | 1984 | 50.704 | 1983 | 50.575 | 1982 | 50.172 | 1981 | 49.677 | 1980 | 49.142 | 1979 | 45.205 | 1978 | 43.042 | 1977 | 42.734 | 1976 | 31.92 | 1975 | 38.438 | 1974 | 42.358 | 1973 | 45.247 | 1972 | 45.012 | 1971 | 38.768 | 1970 | 33.119 | 1969 | 32.962 | 1968 | 45.343 | 1967 | 45.136 | 1966 | 44.86 | 1965 | 44.627 | 1964 | 44.315 | 1963 | 44.099 | 1962 | 43.807 | 1961 | 43.583 | 1960 | 43.293 |
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