Year	Percent
1998-01-01	46.4297
1999-01-01	57.8527
2000-01-01	54.4000
2001-01-01	55.3000
2002-01-01	53.6051
2003-01-01	61.8380
2004-01-01	60.4822
2005-01-01	56.2494
2006-01-01	64.7431
2007-01-01	64.1042
2008-01-01	58.6213
2009-01-01	63.5400
2010-01-01	70.4006
2011-01-01	69.4523
2012-01-01	72.5075
2013-01-01	74.2468
2014-01-01	73.2434
2015-01-01	73.5390
2016-01-01	74.5771