Year	Percent
1996-01-01	50.373800000000000
1997-01-01	50.482200000000000
1998-01-01	54.109100000000000
1999-01-01	58.126500000000000
2000-01-01	47.674200000000000
2001-01-01	59.004600000000000
2002-01-01	59.745800000000000
2003-01-01	51.196200000000000
2004-01-01	50.459400000000000
2005-01-01	41.924700000000000
2006-01-01	42.603800000000000
2007-01-01	41.890200000000000
2008-01-01	52.551000000000000
2009-01-01	42.229300000000000
2010-01-01	45.163999999999994
2011-01-01	51.867300000000000
2012-01-01	41.913700000000000
2013-01-01	45.394700000000000
2014-01-01	47.954100000000000