Year	Percent
1998-01-01	18.9000
1999-01-01	15.0000
2000-01-01	16.9000
2001-01-01	18.0000
2002-01-01	19.4000
2003-01-01	22.3000
2004-01-01	21.2000
2005-01-01	22.9000
2006-01-01	25.0000
2007-01-01	12.5000
2008-01-01	12.1000
2009-01-01	13.7000
2010-01-01	13.4251
2011-01-01	11.6429
2012-01-01	12.9824
2013-01-01	14.4950
2014-01-01	14.9268
2015-01-01	15.1305
2016-01-01	16.6391