Year	Percent
1991-01-01	32.26100158691410
1992-01-01	30.82799911499020
1993-01-01	32.43000030517580
1994-01-01	31.03599929809570
1995-01-01	31.48100090026860
1996-01-01	29.55900001525880
1997-01-01	25.61599922180180
1998-01-01	25.25000000000000
1999-01-01	25.46800041198730
2000-01-01	28.56299972534180
2001-01-01	31.55200004577640
2002-01-01	20.42900085449220
2003-01-01	26.88400077819820
2004-01-01	20.24300003051760
2005-01-01	15.73900032043460
2006-01-01	9.96700000762939
2007-01-01	8.40200042724609
2008-01-01	13.38199996948240
2009-01-01	29.60899925231930
2010-01-01	35.71400070190430
2011-01-01	32.56000137329100
2012-01-01	26.65399932861330
2013-01-01	21.90900039672850
2014-01-01	19.26399993896480
2015-01-01	16.28899955749510
2016-01-01	14.40900039672850
2017-01-01	13.20400047302250