Year	Percent
1998-01-01	36.6519
1999-01-01	30.9114
2000-01-01	38.3326
2001-01-01	40.2732
2002-01-01	40.2500
2003-01-01	38.1166
2004-01-01	37.3200
2005-01-01	41.3726
2006-01-01	41.3029
2007-01-01	40.3021
2008-01-01	50.2581
2009-01-01	58.8061
2010-01-01	62.4834
2011-01-01	62.3008
2012-01-01	67.6208
2013-01-01	68.9484
2014-01-01	68.8014