Year	Percent
1996-01-01	50.613300000000000
1997-01-01	45.785900000000000
1998-01-01	49.752300000000000
1999-01-01	44.157000000000000
2000-01-01	44.573600000000000
2001-01-01	44.810400000000000
2002-01-01	37.617700000000000
2003-01-01	40.629500000000000
2004-01-01	43.136000000000000
2005-01-01	44.097900000000000
2006-01-01	41.746300000000000
2007-01-01	46.981200000000000
2008-01-01	42.127800000000000
2009-01-01	38.431400000000000
2010-01-01	35.958000000000000
2011-01-01	34.683800000000000
2012-01-01	29.595800000000000
2013-01-01	28.827800000000000
2014-01-01	31.851999999999997