Year	Percent
1996-01-01	1.5327400000000000
1997-01-01	2.0798799999999997
1998-01-01	1.7708500000000000
1999-01-01	2.0836099999999997
2000-01-01	2.1448200000000000
2001-01-01	1.9796900000000002
2002-01-01	2.6354700000000000
2003-01-01	3.5109400000000000
2004-01-01	3.7484900000000003
2005-01-01	3.6201100000000000
2006-01-01	3.8849699999999996
2007-01-01	4.1385600000000000
2008-01-01	4.1033700000000000
2009-01-01	4.0540800000000000
2010-01-01	4.1237800000000000
2011-01-01	4.1366300000000000
2012-01-01	4.0445699999999990
2013-01-01	3.4764100000000000
2014-01-01	3.2257500000000000
2015-01-01	3.0508100000000000
2016-01-01	2.7065300000000000
2017-01-01	2.7725800000000000