Year | Value | 2021 | 62.904 | 2020 | 63.717 | 2019 | 64.119 | 2018 | 63.276 | 2017 | 62.977 | 2016 | 62.209 | 2015 | 61.378 | 2014 | 60.899 | 2013 | 59.729 | 2012 | 58.679 | 2011 | 57.455 | 2010 | 56.381 | 2009 | 55.448 | 2008 | 54.604 | 2007 | 53.946 | 2006 | 53.238 | 2005 | 52.044 | 2004 | 50.453 | 2003 | 48.79 | 2002 | 47.221 | 2001 | 45.895 | 2000 | 44.518 | 1999 | 43.568 | 1998 | 42.848 | 1997 | 43.131 | 1996 | 43.441 | 1995 | 43.641 | 1994 | 43.561 | 1993 | 43.388 | 1992 | 43.413 | 1991 | 43.312 | 1990 | 43.323 | 1989 | 43.34 | 1988 | 43.383 | 1987 | 43.811 | 1986 | 44.343 | 1985 | 44.947 | 1984 | 45.579 | 1983 | 46.038 | 1982 | 45.991 | 1981 | 45.701 | 1980 | 45.094 | 1979 | 44.268 | 1978 | 43.29 | 1977 | 42.233 | 1976 | 41.227 | 1975 | 40.222 | 1974 | 39.271 | 1973 | 38.544 | 1972 | 37.904 | 1971 | 37.239 | 1970 | 36.731 | 1969 | 36.321 | 1968 | 36.036 | 1967 | 35.897 | 1966 | 35.866 | 1965 | 35.724 | 1964 | 35.692 | 1963 | 35.618 | 1962 | 35.654 | 1961 | 35.326 | 1960 | 35.199 |
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