Year	Percent
1998-01-01	80.3271
1999-01-01	60.7286
2000-01-01	73.1000
2001-01-01	69.0500
2002-01-01	69.4694
2003-01-01	70.7548
2004-01-01	75.1114
2005-01-01	77.3994
2006-01-01	77.2137
2007-01-01	73.7764
2008-01-01	72.0507
2009-01-01	73.2430
2010-01-01	72.5215
2011-01-01	71.9500
2012-01-01	72.8996
2013-01-01	75.4845
2014-01-01	75.1036
2015-01-01	73.1746
2016-01-01	76.6025