Year	Percent
1996-01-01	22.894200000000000
1997-01-01	25.192800000000000
1998-01-01	22.368300000000000
1999-01-01	17.522200000000000
2000-01-01	17.987100000000000
2001-01-01	18.249100000000000
2002-01-01	18.386400000000000
2003-01-01	18.516600000000000
2004-01-01	18.498000000000000
2005-01-01	18.141700000000000
2006-01-01	19.581700000000000
2007-01-01	22.691200000000000
2008-01-01	27.045700000000000
2009-01-01	18.927700000000000
2010-01-01	18.595300000000000
2011-01-01	19.612000000000002
2012-01-01	20.632700000000000
2013-01-01	21.128100000000000
2014-01-01	21.275900000000000
2015-01-01	18.799400000000000
2016-01-01	18.593100000000000