Year	Percent
1996-01-01	61.678000000000004
1997-01-01	61.122200000000000
1998-01-01	59.201900000000000
1999-01-01	58.679800000000000
2000-01-01	57.977600000000000
2001-01-01	56.812000000000000
2002-01-01	54.693500000000000
2003-01-01	54.823000000000000
2004-01-01	56.589800000000000
2005-01-01	54.897700000000000
2006-01-01	52.272700000000000
2007-01-01	46.883600000000000
2008-01-01	51.597300000000000
2009-01-01	44.546200000000000
2010-01-01	47.873900000000000
2011-01-01	49.713300000000000
2012-01-01	49.711300000000000
2013-01-01	47.995800000000000
2014-01-01	47.579500000000000