Year	Percent
1998-01-01	17.200000000000000
1999-01-01	12.800000000000000
2000-01-01	11.900000000000000
2001-01-01	19.600000000000000
2002-01-01	22.700000000000000
2003-01-01	18.300000000000000
2004-01-01	16.300000000000000
2005-01-01	13.000000000000000
2006-01-01	7.900000000000000
2007-01-01	6.400000000000000
2008-01-01	7.700000000000000
2009-01-01	16.200000000000000
2010-01-01	18.081900000000000
2011-01-01	14.145999999999999
2012-01-01	13.196700000000000
2013-01-01	11.998900000000000
2014-01-01	11.269200000000000
2015-01-01	14.673600000000000
2016-01-01	17.294400000000000