Year	Percent
1998-01-01	7.600
1999-01-01	7.300
2000-01-01	6.900
2001-01-01	5.300
2002-01-01	5.300
2003-01-01	5.200
2004-01-01	5.100
2005-01-01	6.900
2006-01-01	5.200
2007-01-01	5.000
2008-01-01	5.400
2009-01-01	6.300
2010-01-01	5.430
2011-01-01	5.294
2012-01-01	5.126
2013-01-01	5.125
2014-01-01	5.215
2015-01-01	5.965
2016-01-01	6.551