Year Percent 1996-01-01 0.000000000000000 1997-01-01 10.526300000000000 1998-01-01 10.526300000000000 1999-01-01 10.000000000000000 2000-01-01 9.523810000000001 2001-01-01 8.695650000000000 2002-01-01 0.000000000000000 2003-01-01 0.000000000000000 2004-01-01 8.333330000000000 2005-01-01 8.333330000000000 2006-01-01 7.692310000000001 2007-01-01 6.896550000000000 2008-01-01 6.451610000000000 2009-01-01 6.060610000000000 2010-01-01 11.764700000000000 2011-01-01 11.428600000000000 2012-01-01 10.810800000000000 2013-01-01 5.405410000000000 2014-01-01 5.405410000000000 2015-01-01 6.648770000000000 2016-01-01 9.101460000000001