Year	Percent
1998-01-01	12.0000
1999-01-01	13.2000
2000-01-01	17.4000
2001-01-01	15.0000
2002-01-01	14.3000
2003-01-01	14.5000
2004-01-01	12.5000
2005-01-01	11.9000
2006-01-01	11.4000
2007-01-01	11.1000
2008-01-01	11.6000
2009-01-01	14.0000
2010-01-01	15.2747
2011-01-01	14.9736
2012-01-01	15.6217
2013-01-01	16.5210
2014-01-01	16.9825
2015-01-01	17.5731
2016-01-01	17.6569