Year Percent 2000-01-01 0.70069100000000000 2001-01-01 0.63514500000000000 2002-01-01 0.63514500000000000 2003-01-01 0.63514500000000000 2004-01-01 0.63514500000000000 2005-01-01 0.63514500000000000 2006-01-01 0.63514500000000000 2007-01-01 0.63514500000000000 2008-01-01 0.63514500000000000 2009-01-01 0.63514500000000000 2010-01-01 0.11674100000000001 2011-01-01 0.09150000000000000 2012-01-01 0.08454199999999999 2013-01-01 0.07327600000000000 2014-01-01 0.06551300000000000 2015-01-01 0.02531200000000000 2016-01-01 0.06097400000000000