Year	Percent
1991-01-01	9.32199954986572
1992-01-01	9.34899997711182
1993-01-01	9.80700016021729
1994-01-01	9.79399967193604
1995-01-01	9.81599998474121
1996-01-01	9.84099960327148
1997-01-01	9.82900047302246
1998-01-01	9.82699966430664
1999-01-01	9.80399990081787
2000-01-01	9.86499977111816
2001-01-01	9.87699985504150
2002-01-01	9.92199993133545
2003-01-01	9.90499973297119
2004-01-01	9.90900039672852
2005-01-01	9.86800003051758
2006-01-01	9.85400009155273
2007-01-01	9.84899997711182
2008-01-01	9.83699989318848
2009-01-01	9.84200000762939
2010-01-01	9.84599971771240
2011-01-01	9.78100013732910
2012-01-01	9.76500034332275
2013-01-01	9.76900005340576
2014-01-01	8.51599979400635
2015-01-01	8.04699993133545
2016-01-01	13.06400012969970
2017-01-01	13.41300010681150