Year	Percent
1991-01-01	47.372200000000000
1992-01-01	35.166800000000000
1993-01-01	12.890600000000000
1994-01-01	9.855760000000000
1995-01-01	6.402500000000000
1996-01-01	8.454880000000001
1997-01-01	8.116700000000000
1998-01-01	9.886020000000000
1999-01-01	9.986260000000001
2000-01-01	9.263010000000001
2001-01-01	9.942070000000000
2002-01-01	12.506900000000000
2003-01-01	18.349600000000000
2004-01-01	21.365800000000000
2005-01-01	22.616500000000000
2006-01-01	22.629100000000000
2007-01-01	26.473500000000000
2008-01-01	27.028400000000000
2009-01-01	31.734600000000000
2010-01-01	31.948700000000000
2011-01-01	35.860600000000000
2012-01-01	43.152100000000000
2013-01-01	55.178600000000000
2014-01-01	64.526600000000000
2015-01-01	65.836600000000000
2016-01-01	66.622200000000000