Year	Percent
1998-01-01	4.90000
1999-01-01	4.20000
2000-01-01	3.00000
2001-01-01	3.60000
2002-01-01	2.90000
2003-01-01	2.60000
2004-01-01	1.80000
2005-01-01	2.30000
2006-01-01	2.60000
2007-01-01	2.30000
2008-01-01	3.00000
2009-01-01	8.20000
2010-01-01	10.03720
2011-01-01	13.67750
2012-01-01	16.04280
2013-01-01	16.82570
2014-01-01	15.62150
2015-01-01	11.66310
2016-01-01	7.37432