Year	Percent
1998-01-01	12.4000
1999-01-01	12.0000
2000-01-01	12.1000
2001-01-01	12.6000
2002-01-01	12.2000
2003-01-01	12.4000
2004-01-01	12.2000
2005-01-01	11.9000
2006-01-01	11.2000
2007-01-01	11.7000
2008-01-01	10.1000
2009-01-01	12.8000
2010-01-01	14.1947
2011-01-01	13.5950
2012-01-01	14.5704
2013-01-01	15.5173
2014-01-01	16.4941
2015-01-01	18.9377
2016-01-01	22.0722