Year	Percent
1997-01-01	0.5147030000000000
1998-01-01	0.5147030000000000
1999-01-01	0.2183940000000000
2000-01-01	0.2043080000000000
2001-01-01	1.3506300000000000
2002-01-01	1.7368100000000000
2003-01-01	1.6245100000000001
2004-01-01	4.1217800000000000
2005-01-01	1.8001099999999999
2006-01-01	6.9435899999999995
2007-01-01	6.1155000000000000
2008-01-01	3.5045300000000004
2009-01-01	3.6292800000000005
2010-01-01	19.4974000000000000
2011-01-01	11.5987000000000000
2012-01-01	12.9089000000000000
2013-01-01	24.9181000000000000
2014-01-01	23.1326000000000000
2015-01-01	20.1559000000000000
2016-01-01	17.4017000000000000