Year	Percent
1998-01-01	0.9093129999999999
1999-01-01	5.3456100000000000
2000-01-01	5.2891000000000000
2001-01-01	3.7437500000000000
2002-01-01	3.2828400000000000
2003-01-01	3.6750400000000000
2004-01-01	3.9355900000000004
2005-01-01	4.3687600000000000
2006-01-01	4.6831500000000000
2007-01-01	5.6457100000000000
2008-01-01	4.7385300000000000
2009-01-01	4.3297700000000000
2010-01-01	4.5425300000000000
2011-01-01	4.4476400000000000
2012-01-01	4.2376100000000000
2013-01-01	3.7444200000000000
2014-01-01	3.7066300000000000
2015-01-01	3.3886500000000000
2016-01-01	3.5251300000000003