Year	Percent
1998-01-01	29.8000
1999-01-01	27.8000
2000-01-01	25.0000
2001-01-01	13.6000
2002-01-01	30.5000
2003-01-01	33.8000
2004-01-01	32.3000
2005-01-01	33.7000
2006-01-01	34.9000
2007-01-01	30.1000
2008-01-01	27.5000
2009-01-01	28.4000
2010-01-01	22.2391
2011-01-01	18.2804
2012-01-01	16.7599
2013-01-01	16.6876
2014-01-01	14.4994
2015-01-01	16.1776
2016-01-01	19.9541