Year	Percent
1998-01-01	55.7424
1999-01-01	64.9171
2000-01-01	81.9000
2001-01-01	72.1000
2002-01-01	46.2314
2003-01-01	68.2782
2004-01-01	59.7124
2005-01-01	60.7635
2006-01-01	62.4214
2007-01-01	64.9957
2008-01-01	53.3160
2009-01-01	66.6495
2010-01-01	40.7450
2011-01-01	71.3747
2012-01-01	68.7341
2013-01-01	71.3919
2014-01-01	66.1531
2015-01-01	58.1418
2016-01-01	58.0244