Year	Percent
1998-01-01	57.1764
1999-01-01	46.4841
2000-01-01	55.7000
2001-01-01	57.3000
2002-01-01	57.4198
2003-01-01	55.6017
2004-01-01	53.9334
2005-01-01	55.0075
2006-01-01	57.4117
2007-01-01	55.6557
2008-01-01	48.9452
2009-01-01	51.8149
2010-01-01	54.3774
2011-01-01	54.9180
2012-01-01	53.5767
2013-01-01	53.9955
2014-01-01	54.7065
2015-01-01	54.7636