Year	Percent
1996-01-01	13.70
1997-01-01	12.13
1998-01-01	11.99
1999-01-01	7.92
2000-01-01	9.69
2001-01-01	6.62
2002-01-01	3.03
2003-01-01	2.45
2004-01-01	2.37
2005-01-01	4.53
2006-01-01	5.36
2007-01-01	5.93
2008-01-01	8.24
2009-01-01	0.45
2010-01-01	3.13
2011-01-01	5.23
2012-01-01	4.99
2013-01-01	4.50
2014-01-01	3.00
2015-01-01	3.35
2016-01-01	3.48
2017-01-01	2.50