Year	Percent
1995-01-01	8.41601909852498
1996-01-01	8.48629221729260
1997-01-01	7.73783149302198
1998-01-01	6.97059547442170
1999-01-01	6.32017552217841
2000-01-01	5.67288359014044
2001-01-01	6.09867030749690
2002-01-01	6.47484664288976
2003-01-01	6.36402069119780
2004-01-01	5.94574539075928
2005-01-01	5.65619301576806
2006-01-01	5.27256038342465
2007-01-01	5.02597255809906
2008-01-01	5.06767804465548
2009-01-01	7.02586982617572
2010-01-01	6.79769480120190
2011-01-01	6.27657943736033
2012-01-01	6.01783520111837
2013-01-01	5.89240876195081
2014-01-01	5.75568083212426
2015-01-01	5.81876886164244
2016-01-01	5.97591011642413
2017-01-01	5.47139115537254