Year	Percent
1997-01-01	0.21210700000000002
1998-01-01	0.20572800000000002
1999-01-01	0.40262500000000000
2000-01-01	0.18783600000000000
2001-01-01	0.18062200000000000
2002-01-01	0.17604500000000000
2003-01-01	0.17612000000000000
2004-01-01	0.20756200000000000
2005-01-01	0.23176700000000000
2006-01-01	0.24768400000000002
2007-01-01	0.26177300000000000
2008-01-01	0.34445500000000000
2009-01-01	0.28166700000000000
2010-01-01	0.30852700000000000
2011-01-01	0.33086500000000000
2012-01-01	0.29020200000000000
2013-01-01	0.28679099999999996
2014-01-01	0.29556500000000000
2015-01-01	0.41645900000000000
2016-01-01	0.48744200000000000