Year	Percent
1991-01-01	10.88399982452390
1992-01-01	9.61999988555908
1993-01-01	9.47200012207031
1994-01-01	9.50000000000000
1995-01-01	10.03499984741210
1996-01-01	10.13899993896480
1997-01-01	10.16600036621090
1998-01-01	10.49800014495850
1999-01-01	10.42300033569340
2000-01-01	9.99300003051758
2001-01-01	9.99600028991699
2002-01-01	9.69400024414063
2003-01-01	9.41800022125244
2004-01-01	9.42199993133545
2005-01-01	9.02099990844727
2006-01-01	9.06799983978271
2007-01-01	8.43999958038330
2008-01-01	10.03400039672850
2009-01-01	9.93599987030029
2010-01-01	9.62500000000000
2011-01-01	9.99899959564209
2012-01-01	10.34599971771240
2013-01-01	10.52999973297120
2014-01-01	10.67000007629390
2015-01-01	10.82999992370610
2016-01-01	10.87500000000000
2017-01-01	10.80000019073490