Year	Percent
1991-01-01	13.774000167846700
1992-01-01	12.717000007629400
1993-01-01	12.946999549865700
1994-01-01	12.564000129699700
1995-01-01	12.437999725341800
1996-01-01	12.741000175476100
1997-01-01	12.628999710083000
1998-01-01	13.510000228881800
1999-01-01	14.342000007629400
2000-01-01	14.496999740600600
2001-01-01	14.397999763488800
2002-01-01	11.901000022888200
2003-01-01	9.713999748229980
2004-01-01	8.711999893188480
2005-01-01	7.028999805450440
2006-01-01	4.192999839782710
2007-01-01	1.582999944686890
2008-01-01	1.039000034332280
2009-01-01	1.185999989509580
2010-01-01	1.333999991416930
2011-01-01	1.317000031471250
2012-01-01	1.598999977111820
2013-01-01	1.054000020027160
2014-01-01	0.731999993324280
2015-01-01	0.550999999046326
2016-01-01	0.446999996900558
2017-01-01	0.405000001192093