Year	Percent
1995-01-01	6.14117549787912
1996-01-01	5.78525943780575
1997-01-01	4.91006082472532
1998-01-01	4.55522932806685
1999-01-01	4.74884984705984
2000-01-01	4.08197000029329
2001-01-01	4.18484885890016
2002-01-01	4.25088221771830
2003-01-01	4.83569660127057
2004-01-01	5.07993136187661
2005-01-01	4.43493695001317
2006-01-01	3.33491756359540
2007-01-01	3.44598956333664
2008-01-01	3.16629201835963
2009-01-01	6.62885688367097
2010-01-01	8.35652460536120
2011-01-01	7.66726699212000
2012-01-01	7.50552183963983
2013-01-01	6.74072131629486
2014-01-01	6.38338970219374
2015-01-01	5.92444525731212
2016-01-01	5.76815283390123
2017-01-01	5.56960387683867