Year	Percent
1991-01-01	8.57900047302246
1992-01-01	9.54699993133545
1993-01-01	12.04199981689450
1994-01-01	14.55799961090090
1995-01-01	16.01000022888180
1996-01-01	17.06800079345700
1997-01-01	14.20699977874760
1998-01-01	9.42199993133545
1999-01-01	9.16600036621094
2000-01-01	8.18000030517578
2001-01-01	8.91100025177002
2002-01-01	10.42800045013430
2003-01-01	13.45600032806400
2004-01-01	14.02200031280520
2005-01-01	16.19000053405760
2006-01-01	16.48600006103520
2007-01-01	16.71199989318850
2008-01-01	16.63699913024900
2009-01-01	20.28599929809570
2010-01-01	22.73399925231930
2011-01-01	30.27400016784670
2012-01-01	37.97499847412110
2013-01-01	38.14799880981450
2014-01-01	34.80899810791020
2015-01-01	32.00299835205080
2016-01-01	27.99200057983400
2017-01-01	23.94099998474120