Year	Percent
1998-01-01	11.8000
1999-01-01	9.8000
2000-01-01	7.8000
2001-01-01	6.7000
2002-01-01	6.5000
2003-01-01	6.7000
2004-01-01	6.6000
2005-01-01	5.3000
2006-01-01	6.6000
2007-01-01	5.8000
2008-01-01	6.3000
2009-01-01	9.4000
2010-01-01	10.0278
2011-01-01	11.7424
2012-01-01	13.7464
2013-01-01	16.5427
2014-01-01	18.0330
2015-01-01	18.0644
2016-01-01	17.1162