Year	Percent
1996-01-01	3.3256300000000003
1997-01-01	3.3563000000000000
1998-01-01	3.0384900000000004
1999-01-01	2.8968300000000000
2000-01-01	2.9265400000000000
2001-01-01	2.8022299999999998
2002-01-01	2.7877700000000000
2003-01-01	2.7824600000000000
2004-01-01	2.8063100000000000
2005-01-01	2.9795400000000000
2006-01-01	2.6627500000000000
2007-01-01	2.3882900000000000
2008-01-01	2.7265200000000003
2009-01-01	2.6747400000000003
2010-01-01	3.0420400000000000
2011-01-01	3.2521600000000000
2012-01-01	3.2442599999999997
2013-01-01	3.3496000000000000
2014-01-01	3.3312699999999995
2015-01-01	3.3776500000000000
2016-01-01	2.8653700000000000