Year	Percent
1997-01-01	0.05309199999999999
1998-01-01	0.08825900000000000
1999-01-01	0.11216600000000000
2000-01-01	0.12398300000000000
2001-01-01	0.11282100000000000
2002-01-01	0.15528200000000000
2003-01-01	0.15425200000000000
2004-01-01	0.20494300000000000
2005-01-01	0.19406300000000000
2006-01-01	0.22210200000000000
2007-01-01	0.12567500000000000
2008-01-01	0.11876099999999999
2009-01-01	0.22305900000000000
2010-01-01	0.19157100000000000
2011-01-01	0.53516900000000000
2012-01-01	0.54742899999999990
2013-01-01	0.51060400000000000
2014-01-01	0.51160800000000000
2015-01-01	0.50067200000000000