Year	Percent
1996-01-01	92.953400000000000
1997-01-01	79.036800000000000
1998-01-01	54.678000000000004
1999-01-01	42.738900000000000
2000-01-01	52.745900000000000
2001-01-01	56.883700000000000
2002-01-01	51.074200000000000
2003-01-01	53.818800000000000
2004-01-01	60.984700000000000
2005-01-01	52.246300000000000
2006-01-01	53.915000000000000
2007-01-01	49.741300000000000
2008-01-01	56.224000000000000
2009-01-01	55.972100000000000
2010-01-01	49.144000000000000
2011-01-01	47.565600000000000
2012-01-01	44.647500000000000
2013-01-01	43.745200000000000
2014-01-01	43.911100000000000
2015-01-01	44.617200000000000
2016-01-01	38.971400000000000