| Year | Value | | 2014 | 96.286210761489 | | 2013 | 94.649655211328 | | 2012 | 92.848912069006 | | 2011 | 89.475833730831 | | 2010 | 86.411559833493 | | 2009 | 84.309157790426 | | 2008 | 80.511574536917 | | 2007 | 83.727250110041 | | 2006 | 80.552954366404 | | 2005 | 85.460064723639 | | 2004 | 85.048169835767 | | 2003 | 87.812194965685 | | 2002 | 84.79153843255 | | 2001 | 78.800061902729 | | 2000 | 71.879910400856 | | 1999 | 74.687764828598 | | 1998 | 70.175347959942 | | 1997 | 80.730995160068 | | 1996 | 74.644236294501 | | 1995 | 68.606818034322 | | 1994 | 69.033047735618 | | 1993 | 64.600167859499 | | 1992 | 64.024052222806 |
|