Year	Percent
1991-01-01	11.82800006866460
1992-01-01	18.18899917602540
1993-01-01	17.09499931335450
1994-01-01	14.68799972534180
1995-01-01	14.17300033569340
1996-01-01	20.20800018310550
1997-01-01	19.07999992370610
1998-01-01	23.61300086975100
1999-01-01	29.34700012207030
2000-01-01	18.06200027465820
2001-01-01	20.79199981689450
2002-01-01	17.45899963378910
2003-01-01	21.84099960327150
2004-01-01	18.09600067138670
2005-01-01	15.52499961853030
2006-01-01	16.38500022888180
2007-01-01	13.02400016784670
2008-01-01	15.80099964141850
2009-01-01	14.20199966430660
2010-01-01	9.37699985504150
2011-01-01	8.98400020599365
2012-01-01	8.64599990844727
2013-01-01	8.41899967193604
2014-01-01	9.06599998474121
2015-01-01	8.83899974822998
2016-01-01	10.38099956512450
2017-01-01	8.51200008392334