Year	Percent
1998-01-01	70.7804
1999-01-01	78.1903
2000-01-01	63.5000
2001-01-01	65.2000
2002-01-01	65.4046
2003-01-01	67.3687
2004-01-01	67.1942
2005-01-01	73.4751
2006-01-01	65.0166
2007-01-01	55.8560
2008-01-01	49.9546
2009-01-01	54.7077
2010-01-01	57.4073
2011-01-01	61.8853
2012-01-01	67.6339
2013-01-01	80.5847
2014-01-01	84.6481
2015-01-01	85.0161
2016-01-01	87.1704