Year	Percent
1999-01-01	23.000000000000000
2000-01-01	16.200000000000000
2001-01-01	15.600000000000000
2002-01-01	14.700000000000000
2003-01-01	12.300000000000000
2004-01-01	13.800000000000000
2005-01-01	12.400000000000000
2006-01-01	13.300000000000000
2007-01-01	11.600000000000000
2008-01-01	12.900000000000000
2009-01-01	13.100000000000000
2010-01-01	14.630100000000000
2011-01-01	14.760100000000000
2012-01-01	15.030999999999999
2013-01-01	15.056400000000000
2014-01-01	11.227700000000000
2015-01-01	8.016480000000000
2016-01-01	9.781220000000000