Year	Percent
1999-01-01	9.118170000000000
2000-01-01	7.096950000000000
2001-01-01	6.825810000000001
2002-01-01	6.655850000000000
2003-01-01	7.093210000000001
2004-01-01	7.046430000000000
2005-01-01	6.789700000000000
2006-01-01	7.511870000000000
2007-01-01	12.166300000000000
2008-01-01	12.722999999999999
2009-01-01	17.129400000000000
2010-01-01	15.725900000000000
2011-01-01	16.031700000000000
2012-01-01	17.565900000000000
2013-01-01	17.436500000000000
2014-01-01	15.718800000000000
2015-01-01	14.943900000000000
2016-01-01	13.373600000000000