Year	Percent
1998-01-01	67.99550000000000
1999-01-01	75.53380000000000
2000-01-01	77.83220000000000
2001-01-01	78.12500000000000
2002-01-01	63.59060000000000
2003-01-01	64.95430000000000
2004-01-01	68.76710000000000
2005-01-01	66.80199999999999
2006-01-01	67.58560000000000
2007-01-01	63.14000000000000
2008-01-01	64.52940000000000
2009-01-01	64.67110000000000
2010-01-01	62.52230000000000
2011-01-01	55.60140000000000
2012-01-01	48.47900000000000
2013-01-01	45.94940000000000
2014-01-01	47.00880000000000