Year	Percent
1991-01-01	18.36400032043460
1992-01-01	15.87600040435790
1993-01-01	15.95499992370610
1994-01-01	17.64200019836430
1995-01-01	18.52599906921390
1996-01-01	25.29899978637700
1997-01-01	25.98699951171880
1998-01-01	26.47599983215330
1999-01-01	27.50399971008300
2000-01-01	17.58799934387210
2001-01-01	16.67300033569340
2002-01-01	15.59599971771240
2003-01-01	18.12999916076660
2004-01-01	19.44599914550780
2005-01-01	18.38500022888180
2006-01-01	17.19799995422360
2007-01-01	14.19699954986570
2008-01-01	11.03999996185300
2009-01-01	15.34899997711180
2010-01-01	17.81100082397460
2011-01-01	14.88000011444090
2012-01-01	13.09200000762940
2013-01-01	12.21000003814700
2014-01-01	9.85299968719482
2015-01-01	10.73700046539310
2016-01-01	11.23499965667720
2017-01-01	12.83600044250490