Year	Percent
1998-01-01	11.500000000000000
1999-01-01	11.900000000000000
2000-01-01	11.600000000000000
2001-01-01	10.500000000000000
2002-01-01	11.700000000000000
2003-01-01	18.700000000000000
2004-01-01	19.100000000000000
2005-01-01	17.200000000000000
2006-01-01	15.100000000000000
2007-01-01	15.100000000000000
2008-01-01	13.600000000000000
2009-01-01	14.600000000000000
2010-01-01	14.408600000000000
2011-01-01	14.187999999999999
2012-01-01	16.982100000000000
2013-01-01	15.976300000000000
2014-01-01	17.336200000000000
2015-01-01	23.092400000000000
2016-01-01	23.072600000000000