Year	Percent
1998-01-01	48.750
1999-01-01	5.160
2000-01-01	3.970
2001-01-01	4.290
2002-01-01	3.440
2003-01-01	3.630
2004-01-01	3.420
2005-01-01	3.395
2006-01-01	3.870
2007-01-01	4.050
2008-01-01	3.760
2009-01-01	6.060
2010-01-01	7.220
2011-01-01	6.215
2012-01-01	8.510
2013-01-01	9.470
2014-01-01	9.865
2015-01-01	10.090