Year	Percent
1991-01-01	3.41000008583069
1992-01-01	7.39699983596802
1993-01-01	10.88000011444090
1994-01-01	11.39400005340580
1995-01-01	13.94600009918210
1996-01-01	15.77499961853030
1997-01-01	18.44000053405760
1998-01-01	14.83199977874760
1999-01-01	21.99699974060060
2000-01-01	21.08600044250490
2001-01-01	23.84600067138670
2002-01-01	20.20400047302250
2003-01-01	26.62599945068360
2004-01-01	25.61300086975100
2005-01-01	15.11900043487550
2006-01-01	12.07900047302250
2007-01-01	10.06200027465820
2008-01-01	11.96700000762940
2009-01-01	27.31100082397460
2010-01-01	32.85200119018550
2011-01-01	22.37500000000000
2012-01-01	20.85499954223630
2013-01-01	18.73200035095210
2014-01-01	14.97399997711180
2015-01-01	13.10499954223630
2016-01-01	13.40799999237060
2017-01-01	12.22599983215330