Year	Percent
1999-01-01	58.047900000000000
2000-01-01	59.087200000000000
2001-01-01	57.147300000000000
2002-01-01	57.083999999999996
2003-01-01	57.129600000000000
2004-01-01	53.311800000000000
2005-01-01	53.630400000000000
2006-01-01	50.708300000000000
2007-01-01	49.349300000000000
2008-01-01	54.044700000000000
2009-01-01	48.716700000000000
2010-01-01	48.303900000000000
2011-01-01	52.716900000000000
2012-01-01	50.745500000000000
2013-01-01	49.401200000000000
2014-01-01	49.402400000000000