Year	Percent
1998-01-01	20.300000000000000
1999-01-01	22.000000000000000
2000-01-01	29.300000000000000
2001-01-01	13.700000000000000
2002-01-01	8.100000000000000
2003-01-01	4.900000000000000
2004-01-01	4.000000000000000
2005-01-01	3.900000000000000
2006-01-01	3.600000000000000
2007-01-01	2.400000000000000
2008-01-01	2.800000000000000
2009-01-01	4.600000000000000
2010-01-01	5.386070000000000
2011-01-01	5.217250000000000
2012-01-01	5.239480000000000
2013-01-01	5.197280000000000
2014-01-01	5.607419999999999
2015-01-01	5.484050000000000
2016-01-01	4.594900000000000