Year	Percent
1991-01-01	9.46011168683127
1992-01-01	8.61075493756340
1993-01-01	8.63637065176996
1994-01-01	8.65423191354735
1995-01-01	9.07103169364101
1996-01-01	9.20814281321744
1997-01-01	9.62124256678564
1998-01-01	10.50637670823150
1999-01-01	10.74483204122200
2000-01-01	10.36320896285310
2001-01-01	10.43504561144000
2002-01-01	10.37160526189010
2003-01-01	10.16130614747410
2004-01-01	10.26123256518310
2005-01-01	10.32496052305880
2006-01-01	10.29119639336760
2007-01-01	9.69183603053320
2008-01-01	10.35134296023230
2009-01-01	10.37318389432920
2010-01-01	9.99046077835419
2011-01-01	10.12498090076820
2012-01-01	9.98254050691659
2013-01-01	10.07688925143730
2014-01-01	10.18029859832450
2015-01-01	10.43960172924660
2016-01-01	10.23481990205140
2017-01-01	10.17466877856770