Year	Percent
1996-01-01	52.498600000000000
1997-01-01	49.749200000000000
1998-01-01	45.356100000000000
1999-01-01	41.825300000000000
2000-01-01	45.820400000000000
2001-01-01	40.541700000000000
2002-01-01	35.873100000000000
2003-01-01	29.225800000000000
2004-01-01	31.778000000000002
2005-01-01	34.958200000000000
2006-01-01	30.424200000000000
2007-01-01	32.611999999999995
2008-01-01	17.592100000000000
2009-01-01	20.773200000000000
2010-01-01	24.178400000000000
2011-01-01	21.892000000000000
2012-01-01	24.449500000000000
2013-01-01	20.980000000000000
2014-01-01	21.849600000000000
2015-01-01	25.865400000000000
2016-01-01	26.885500000000000