Year	Percent
1997-01-01	8.3592400000000000
1998-01-01	7.4749300000000005
1999-01-01	8.2380600000000000
2000-01-01	7.9763399999999995
2001-01-01	8.0449200000000000
2002-01-01	8.0789700000000000
2003-01-01	7.9129000000000000
2004-01-01	9.0753399999999990
2005-01-01	10.0255000000000000
2006-01-01	8.6134600000000000
2007-01-01	9.1876900000000000
2008-01-01	6.4083500000000000
2009-01-01	8.3993100000000000
2010-01-01	8.8615800000000000
2011-01-01	7.7390500000000000
2012-01-01	7.6687000000000000
2013-01-01	7.1488200000000000
2014-01-01	8.2345399999999990
2015-01-01	9.8433500000000000
2016-01-01	10.5120000000000000