Year	Percent
1996-01-01	58.619800000000000
1997-01-01	49.008600000000000
1998-01-01	43.740400000000000
1999-01-01	43.698600000000000
2000-01-01	45.008700000000000
2001-01-01	48.738300000000000
2002-01-01	42.099600000000000
2003-01-01	41.626800000000000
2004-01-01	49.663600000000000
2005-01-01	49.502900000000000
2006-01-01	47.090400000000000
2007-01-01	40.398200000000000
2008-01-01	36.492200000000000
2009-01-01	39.259600000000000
2010-01-01	41.606000000000000
2011-01-01	39.364700000000000
2012-01-01	33.580999999999996
2013-01-01	33.595100000000000
2014-01-01	28.766300000000000
2015-01-01	24.711500000000000
2016-01-01	28.898400000000000