Year	Percent
1998-01-01	2.6106599999999998
1999-01-01	4.3292600000000000
2000-01-01	2.4229300000000000
2001-01-01	2.6369400000000000
2002-01-01	2.5833200000000000
2003-01-01	2.2208500000000000
2004-01-01	2.5298800000000000
2005-01-01	2.4103700000000000
2006-01-01	2.6912599999999998
2007-01-01	2.9739100000000000
2008-01-01	2.5377099999999997
2009-01-01	2.8099300000000000
2010-01-01	2.5985000000000000
2011-01-01	2.4110600000000000
2012-01-01	2.2935000000000000
2013-01-01	2.1700700000000000
2014-01-01	2.0367400000000000
2015-01-01	1.7873000000000000
2016-01-01	1.9516700000000000