Year | Value | 2014 | 74.441668794091 | 2013 | 75.306152647661 | 2012 | 72.645629298403 | 2011 | 73.196433821655 | 2010 | 73.608445235125 | 2009 | 72.074484060003 | 2008 | 72.041055956226 | 2007 | 69.638905799986 | 2006 | 69.255393169756 | 2005 | 68.547567032582 | 2004 | 68.213007281867 | 2003 | 66.544074782764 | 2002 | 65.379354339531 | 2001 | 69.759995897507 | 2000 | 63.023615468274 | 1999 | 67.178399789637 | 1998 | 69.29553199141 | 1997 | 71.830685470773 | 1996 | 69.836881914083 | 1995 | 65.767157682225 | 1994 | 67.905022102662 | 1993 | 63.023154116999 | 1992 | 58.899880821775 | 1991 | 55.054939043001 |
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