Year	Percent
1991-01-01	6.96400022506714
1992-01-01	7.28100013732910
1993-01-01	8.56599998474121
1994-01-01	6.96799993515015
1995-01-01	6.00000000000000
1996-01-01	5.84899997711182
1997-01-01	7.27600002288818
1998-01-01	15.46100044250490
1999-01-01	13.69699954986570
2000-01-01	10.58399963378910
2001-01-01	10.03299999237060
2002-01-01	8.40999984741211
2003-01-01	9.89299964904785
2004-01-01	10.23400020599370
2005-01-01	9.95800018310547
2006-01-01	9.71100044250488
2007-01-01	8.60799980163574
2008-01-01	9.13500022888184
2009-01-01	9.72599983215332
2010-01-01	9.71800041198730
2011-01-01	9.52999973297119
2012-01-01	8.90400028228760
2013-01-01	9.23299980163574
2014-01-01	9.89099979400635
2015-01-01	10.39000034332280
2016-01-01	10.52999973297120
2017-01-01	10.22999954223630