Year | Value | 2015 | 63.544853493595 | 2014 | 62.423786033155 | 2013 | 63.417052121664 | 2012 | 61.954465587909 | 2011 | 65.38544383796 | 2010 | 64.834439527382 | 2009 | 63.852967960506 | 2008 | 66.735173166847 | 2007 | 67.489317115306 | 2006 | 70.201671494066 | 2005 | 70.643648175988 | 2004 | 69.654181829008 | 2003 | 70.190608526091 | 2002 | 67.710553286063 | 2001 | 67.555932574261 | 2000 | 65.75385172678 | 1999 | 66.015469100553 | 1998 | 69.124833980264 | 1997 | 69.209324672392 | 1996 | 69.522666364409 | 1995 | 67.253218511185 | 1994 | 67.111931061043 | 1993 | 65.778664075221 | 1992 | 66.226938082485 | 1991 | 68.350020266728 | 1990 | 67.296463022663 | 1989 | 63.962589204353 | 1988 | 62.193666019133 | 1987 | 66.492876438691 | 1986 | 66.93517754904 | 1985 | 67.242415796798 | 1984 | 67.081762530313 | 1983 | 66.039197962084 | 1982 | 65.054792536989 | 1981 | 66.189040319203 | 1980 | 67.040002805538 | 1979 | 66.210026816883 | 1978 | 64.221877247272 | 1977 | 63.782336672257 | 1976 | 66.640043249069 | 1975 | 61.210900677561 | 1974 | 62.331167108951 | 1973 | 63.126172012072 | 1972 | 63.003481803612 | 1971 | 60.852221160901 | 1970 | 55.955582391588 | 1969 | 54.652029494791 | 1968 | 50.182523611397 | 1967 | 44.985256682815 | 1966 | 41.478288856216 | 1965 | 40.618679467095 | 1964 | 42.554276374947 | 1963 | 40.795850143388 | 1962 | 39.030296974136 | 1961 | 35.327553885835 | 1960 | 32.475674334411 |
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