Year	Percent
1998-01-01	4.200
1999-01-01	3.300
2000-01-01	3.100
2001-01-01	2.200
2002-01-01	3.600
2003-01-01	4.700
2004-01-01	7.100
2005-01-01	5.800
2006-01-01	6.200
2007-01-01	4.700
2008-01-01	6.050
2009-01-01	6.150
2010-01-01	5.075
2011-01-01	6.250
2012-01-01	5.875
2013-01-01	6.400
2014-01-01	5.800
2015-01-01	7.350
2016-01-01	6.625
2017-01-01	5.500