Year	Percent
1998-01-01	5.0000000000000000
1999-01-01	4.3000000000000000
2000-01-01	3.5000000000000000
2001-01-01	3.5000000000000000
2002-01-01	4.1000000000000000
2003-01-01	3.2000000000000000
2004-01-01	4.3000000000000000
2005-01-01	4.3000000000000000
2006-01-01	4.3000000000000000
2007-01-01	4.3000000000000000
2008-01-01	4.3000000000000000
2009-01-01	4.3000000000000000
2010-01-01	4.3000000000000000
2011-01-01	6.8933200000000000
2012-01-01	5.4184400000000000
2013-01-01	6.0389500000000000
2014-01-01	5.8545099999999990
2015-01-01	5.4336199999999995