Year	Percent
1999-01-01	9.120
2000-01-01	8.820
2001-01-01	9.160
2002-01-01	10.160
2003-01-01	9.875
2004-01-01	10.670
2005-01-01	9.110
2006-01-01	9.120
2007-01-01	8.610
2008-01-01	6.090
2009-01-01	7.310
2010-01-01	7.455
2011-01-01	8.365
2012-01-01	10.980
2013-01-01	11.350
2014-01-01	13.300
2015-01-01	13.810