Year	Percent
1996-01-01	46.150400000000000
1997-01-01	46.067400000000000
1998-01-01	52.989500000000000
1999-01-01	51.186000000000010
2000-01-01	56.820700000000000
2001-01-01	59.382400000000000
2002-01-01	54.991800000000000
2003-01-01	57.428400000000000
2004-01-01	62.294400000000000
2005-01-01	65.083500000000000
2006-01-01	64.539300000000000
2007-01-01	60.616800000000000
2008-01-01	60.554500000000000
2009-01-01	62.509700000000000
2010-01-01	63.824200000000000
2011-01-01	62.629500000000000
2012-01-01	61.791100000000000
2013-01-01	60.346000000000004
2014-01-01	61.128700000000000
2015-01-01	57.467300000000000
2016-01-01	57.670300000000000