Year	Percent
1996-01-01	61.111100000000000
1997-01-01	74.444400000000000
1998-01-01	66.144200000000000
1999-01-01	59.090900000000000
2000-01-01	56.872000000000000
2001-01-01	56.291400000000000
2002-01-01	60.360400000000000
2003-01-01	59.971700000000000
2004-01-01	61.195900000000000
2005-01-01	52.204200000000000
2006-01-01	53.358900000000000
2007-01-01	49.730200000000000
2008-01-01	58.246700000000000
2009-01-01	42.915000000000000
2010-01-01	53.361999999999995
2011-01-01	38.350300000000000
2012-01-01	36.549800000000000
2013-01-01	38.751200000000000
2014-01-01	38.832900000000000