Year Percent 1996-01-01 0.248761000000000000 1997-01-01 0.183242000000000020 1998-01-01 0.137677000000000000 1999-01-01 0.121794000000000000 2000-01-01 0.103074000000000000 2001-01-01 0.092550000000000000 2002-01-01 0.072740000000000000 2003-01-01 0.064756000000000000 2004-01-01 0.052160000000000005 2005-01-01 0.057418000000000000 2006-01-01 0.055822000000000004 2007-01-01 0.086654000000000000 2008-01-01 0.106492000000000000 2009-01-01 0.076843000000000000 2010-01-01 0.096618000000000000 2011-01-01 0.096632000000000010 2012-01-01 0.097633000000000000 2013-01-01 0.106095000000000010 2014-01-01 0.075083000000000010 2015-01-01 0.075656000000000000