Year	Percent
1998-01-01	0.32539900000000000
1999-01-01	0.33906200000000000
2000-01-01	0.28921500000000000
2001-01-01	0.32590100000000000
2002-01-01	0.35865700000000000
2003-01-01	0.31083500000000000
2004-01-01	0.30645200000000000
2005-01-01	0.28056600000000000
2006-01-01	0.26493800000000000
2007-01-01	0.30615000000000000
2008-01-01	0.28744200000000003
2009-01-01	0.31367700000000000
2010-01-01	0.32789400000000000
2011-01-01	0.37563900000000000
2012-01-01	0.43147299999999994
2013-01-01	0.43688999999999995
2014-01-01	0.43724700000000005
2015-01-01	0.43973300000000000
2016-01-01	0.41699300000000000