Year | Value | 2015 | 64.967363325536 | 2014 | 67.048738275426 | 2013 | 71.832964493836 | 2012 | 86.59501601677 | 2011 | 79.669316401028 | 2010 | 83.365231975097 | 2009 | 84.801429035806 | 2008 | 82.908005620772 | 2007 | 85.526707130188 | 2006 | 87.017112001833 | 2005 | 88.74592966242 | 2004 | 91.067093132612 | 2003 | 96.256399222805 | 2002 | 96.23412585158 | 2001 | 96.486469347016 | 2000 | 96.479046799982 | 1999 | 96.418695210589 | 1998 | 96.515643933351 | 1997 | 96.526877624446 | 1996 | 96.507054040904 | 1995 | 96.467885159928 | 1994 | 96.508581214803 | 1993 | 96.378607057778 | 1992 | 96.53607320841 | 1991 | 96.191607459746 | 1990 | 96.301198811872 | 1989 | 96.526602683016 | 1988 | 96.515654935355 | 1987 | 96.360293393778 | 1986 | 96.225815499878 | 1985 | 96.273886237669 | 1984 | 99.264328996565 | 1983 | 99.075440824003 | 1982 | 99.00084570817 | 1981 | 97.938532664813 | 1980 | 98.038220631471 | 1979 | 98.870399169872 | 1978 | 98.909306662693 | 1977 | 98.792624771867 | 1976 | 98.639096465476 | 1975 | 6.3556062257082 | 1974 | 27.018278516694 | 1973 | 20.795941541547 | 1972 | -12.889980520643 | 1971 | -3.4682234010208 |
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