Year	Percent
1998-01-01	4.9000000000000000
1999-01-01	5.2000000000000000
2000-01-01	5.2000000000000000
2001-01-01	5.1000000000000000
2002-01-01	4.7000000000000000
2003-01-01	4.9000000000000000
2004-01-01	4.9000000000000000
2005-01-01	4.8000000000000000
2006-01-01	5.2000000000000000
2007-01-01	6.5000000000000000
2008-01-01	6.3000000000000000
2009-01-01	7.0000000000000000
2010-01-01	7.4927600000000005
2011-01-01	7.1860500000000000
2012-01-01	7.7701100000000010
2013-01-01	7.9859399999999990
2014-01-01	6.8419200000000000
2015-01-01	7.4468900000000000
2016-01-01	7.3342300000000010