Year	Percent
1991-01-01	9.71899986267090
1992-01-01	8.35999965667725
1993-01-01	8.44999980926514
1994-01-01	9.44900035858154
1995-01-01	9.88300037384033
1996-01-01	12.68500041961670
1997-01-01	13.38799953460690
1998-01-01	13.66100025177000
1999-01-01	14.31700038909910
2000-01-01	13.70699977874760
2001-01-01	14.21700000762940
2002-01-01	20.07699966430660
2003-01-01	16.63899993896480
2004-01-01	15.24499988555910
2005-01-01	14.48499965667720
2006-01-01	14.56299972534180
2007-01-01	14.83399963378910
2008-01-01	15.41600036621090
2009-01-01	16.76899909973140
2010-01-01	16.51799964904790
2011-01-01	16.44400024414060
2012-01-01	17.45499992370610
2013-01-01	13.39099979400630
2014-01-01	13.98600006103520
2015-01-01	15.04100036621090
2016-01-01	15.59300041198730
2017-01-01	15.74400043487550