Year	Percent
1991-01-01	7.85200023651123
1992-01-01	13.50899982452390
1993-01-01	22.46500015258790
1994-01-01	22.39999961853030
1995-01-01	21.72699928283690
1996-01-01	23.39399909973140
1997-01-01	24.01000022888180
1998-01-01	19.31500053405760
1999-01-01	15.17599964141850
2000-01-01	12.35400009155270
2001-01-01	15.59200000762940
2002-01-01	17.37999916076660
2003-01-01	18.00399971008300
2004-01-01	22.78100013732910
2005-01-01	21.58099937438960
2006-01-01	21.34099960327150
2007-01-01	18.90200042724610
2008-01-01	19.81999969482420
2009-01-01	24.77599906921390
2010-01-01	24.51499938964840
2011-01-01	22.45299911499020
2012-01-01	23.36199951171880
2013-01-01	23.17600059509280
2014-01-01	22.49500083923340
2015-01-01	20.02099990844730
2016-01-01	18.74500083923340
2017-01-01	17.82799911499020