Year	Percent
1996-01-01	2.9338599999999997
1997-01-01	3.4070300000000002
1998-01-01	3.5308800000000002
1999-01-01	3.7526400000000000
2000-01-01	3.9052900000000000
2001-01-01	4.0814300000000000
2002-01-01	4.2070099999999995
2003-01-01	4.0833800000000000
2004-01-01	3.9184500000000000
2005-01-01	3.6251599999999997
2006-01-01	3.7181400000000000
2007-01-01	3.8612699999999998
2008-01-01	3.9384600000000000
2009-01-01	3.5954400000000000
2010-01-01	3.3996300000000000
2011-01-01	3.5671800000000005
2012-01-01	3.6729700000000000
2013-01-01	3.3350100000000000
2014-01-01	3.3372800000000002
2015-01-01	3.4019999999999997
2016-01-01	3.3077300000000003