Year	Percent
1999-01-01	0.51682100000000000
2000-01-01	0.50442500000000000
2001-01-01	0.45516100000000000
2002-01-01	0.47354799999999997
2003-01-01	0.49266600000000000
2004-01-01	0.48361600000000000
2005-01-01	0.45453599999999994
2006-01-01	0.43395200000000006
2007-01-01	0.44644500000000000
2008-01-01	0.40049500000000000
2009-01-01	0.43206100000000000
2010-01-01	0.44565900000000000
2011-01-01	0.39471300000000004
2012-01-01	0.38476600000000000
2013-01-01	0.39455800000000000
2014-01-01	0.37910600000000000
2015-01-01	0.41341200000000000