Year	Percent
1997-01-01	10.5190000000000000
1998-01-01	7.7862399999999990
1999-01-01	7.5193400000000000
2000-01-01	5.3876200000000000
2001-01-01	4.4052900000000000
2002-01-01	3.6171100000000000
2003-01-01	3.9686100000000000
2004-01-01	4.2773800000000000
2005-01-01	6.3223699999999990
2006-01-01	6.0397200000000000
2007-01-01	5.8163000000000000
2008-01-01	5.7717000000000000
2009-01-01	4.2459000000000000
2010-01-01	4.3613500000000000
2011-01-01	3.9513599999999998
2012-01-01	3.7131800000000004
2013-01-01	3.4054300000000004
2014-01-01	2.8904500000000000
2015-01-01	2.8945500000000000
2016-01-01	2.3535400000000000