Year	Percent
1991-01-01	4.89300012588501
1992-01-01	9.80599975585938
1993-01-01	9.91199970245361
1994-01-01	11.48700046539310
1995-01-01	11.80799961090090
1996-01-01	8.43900012969971
1997-01-01	7.90999984741211
1998-01-01	6.84200000762939
1999-01-01	4.21400022506714
2000-01-01	4.29500007629395
2001-01-01	4.87900018692017
2002-01-01	6.22499990463257
2003-01-01	12.39900016784670
2004-01-01	11.86699962615970
2005-01-01	7.08699989318848
2006-01-01	7.86899995803833
2007-01-01	6.59899997711182
2008-01-01	7.83599996566772
2009-01-01	15.45100021362300
2010-01-01	15.88599967956540
2011-01-01	14.20300006866460
2012-01-01	13.25899982452390
2013-01-01	10.45300006866460
2014-01-01	9.61600017547607
2015-01-01	8.59899997711182
2016-01-01	6.33599996566772
2017-01-01	7.59499979019165