Year Percent 1993-01-01 0.16575000000000000 1994-01-01 0.22546900000000000 1995-01-01 0.22351999999999997 1996-01-01 0.20076900000000000 1997-01-01 0.20155300000000000 1998-01-01 0.21549300000000000 1999-01-01 0.24572500000000000 2000-01-01 0.24163500000000000 2001-01-01 0.24136000000000000 2002-01-01 0.23861700000000000 2003-01-01 0.34135500000000000 2004-01-01 0.38903699999999997 2005-01-01 0.46229600000000000 2006-01-01 0.45313100000000006 2007-01-01 0.54609300000000000 2008-01-01 0.52096800000000000 2009-01-01 0.46685000000000000 2010-01-01 0.44993599999999995 2011-01-01 0.39134300000000000 2012-01-01 0.35538900000000000 2013-01-01 0.36155600000000000 2014-01-01 0.33247300000000000 2015-01-01 0.28854400000000000 2016-01-01 0.33341400000000000