Year	Percent
1999-01-01	62.6318
2000-01-01	59.6763
2001-01-01	70.8195
2002-01-01	63.6279
2003-01-01	59.8214
2004-01-01	56.5872
2005-01-01	50.0103
2006-01-01	42.6649
2007-01-01	44.0337
2008-01-01	43.0722
2009-01-01	61.9712
2010-01-01	61.4322
2011-01-01	53.1018
2012-01-01	54.6980
2013-01-01	58.0812
2014-01-01	61.4478
2015-01-01	74.7581
2016-01-01	84.3968