Year Percent 1996-01-01 0.185770000000000000 1997-01-01 0.185770000000000000 1998-01-01 0.185770000000000000 1999-01-01 0.185770000000000000 2000-01-01 0.185770000000000000 2001-01-01 0.185770000000000000 2002-01-01 0.185770000000000000 2003-01-01 0.185770000000000000 2004-01-01 0.185770000000000000 2005-01-01 0.185770000000000000 2006-01-01 0.140110999999999990 2007-01-01 0.239258000000000000 2008-01-01 0.258412000000000000 2009-01-01 0.166614000000000000 2010-01-01 0.156310999999999980 2011-01-01 0.119042000000000010 2012-01-01 0.105505000000000000 2013-01-01 0.102047000000000000 2014-01-01 0.068927000000000000 2015-01-01 0.044693000000000004 2016-01-01 0.024876000000000000 2017-01-01 0.024332000000000000