Year | Value | 2014 | 68.752048726139 | 2013 | 63.363450971216 | 2012 | 70.337152758943 | 2011 | 68.43693105144 | 2010 | 57.972650228534 | 2009 | 61.722946332494 | 2008 | 64.168585140115 | 2007 | 67.886691656753 | 2006 | 69.404937206252 | 2005 | 65.505405325481 | 2004 | 53.715945022917 | 2003 | 49.15306614305 | 2002 | 47.80617774247 | 2001 | 50.804969483444 | 2000 | 53.841325318925 | 1999 | 52.3467491815 | 1998 | 54.717476511074 | 1997 | 56.191797679709 | 1996 | 57.029591437689 | 1995 | 67.943885270971 | 1994 | 78.69211763513 | 1993 | 76.848596608272 | 1992 | 83.062434591766 | 1991 | 84.05208228691 | 1990 | 83.760782005849 |
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