Year | Value | 2021 | 63.609 | 2020 | 63.675 | 2019 | 64.347 | 2018 | 63.524 | 2017 | 63.302 | 2016 | 62.458 | 2015 | 62.198 | 2014 | 61.346 | 2013 | 60.649 | 2012 | 59.852 | 2011 | 59.094 | 2010 | 58.398 | 2009 | 57.953 | 2008 | 57.407 | 2007 | 56.11 | 2006 | 55.388 | 2005 | 54.6 | 2004 | 53.583 | 2003 | 52.589 | 2002 | 51.846 | 2001 | 50.745 | 2000 | 49.768 | 1999 | 49.319 | 1998 | 48.461 | 1997 | 47.235 | 1996 | 46.321 | 1995 | 45.862 | 1994 | 45.583 | 1993 | 39.343 | 1992 | 45.285 | 1991 | 45.903 | 1990 | 46.711 | 1989 | 47.451 | 1988 | 45.585 | 1987 | 49.282 | 1986 | 49.791 | 1985 | 50.066 | 1984 | 49.922 | 1983 | 49.381 | 1982 | 48.645 | 1981 | 47.815 | 1980 | 46.858 | 1979 | 45.981 | 1978 | 45.102 | 1977 | 44.855 | 1976 | 44.389 | 1975 | 44.105 | 1974 | 44.217 | 1973 | 39.201 | 1972 | 28.352 | 1971 | 44.247 | 1970 | 44.332 | 1969 | 44.315 | 1968 | 44.714 | 1967 | 44.709 | 1966 | 44.84 | 1965 | 43.894 | 1964 | 45.338 | 1963 | 45.009 | 1962 | 44.713 | 1961 | 44.631 | 1960 | 44.451 |
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