Year	Percent
1996-01-01	9.7871800000000010
1997-01-01	5.8295800000000000
1998-01-01	6.2108400000000000
1999-01-01	5.1116199999999990
2000-01-01	4.4704000000000000
2001-01-01	3.7804500000000000
2002-01-01	3.6165000000000000
2003-01-01	3.2015700000000002
2004-01-01	3.3056600000000000
2005-01-01	3.1242000000000000
2006-01-01	3.2208900000000003
2007-01-01	3.3392300000000000
2008-01-01	2.8492500000000000
2009-01-01	2.0248500000000000
2010-01-01	1.5512600000000000
2011-01-01	2.0750200000000000
2012-01-01	2.0969000000000000
2013-01-01	2.3207400000000002
2014-01-01	2.0385700000000000
2015-01-01	1.2487900000000000
2016-01-01	2.5671900000000000