Year	Percent
1999-01-01	28.9017
2000-01-01	30.1501
2001-01-01	32.8877
2002-01-01	36.3369
2003-01-01	38.2136
2004-01-01	58.8889
2005-01-01	60.2278
2006-01-01	61.3162
2007-01-01	57.7809
2008-01-01	58.0254
2009-01-01	59.2211
2010-01-01	60.5265
2011-01-01	58.4703
2012-01-01	55.2063
2013-01-01	54.5284
2014-01-01	54.6082