Year Percent 1994-01-01 0.46248300000000000 1995-01-01 0.40528700000000000 1996-01-01 0.33878500000000000 1997-01-01 0.14540200000000000 1998-01-01 0.14540200000000000 1999-01-01 0.14540200000000000 2000-01-01 0.14540200000000000 2001-01-01 0.14540200000000000 2002-01-01 0.14540200000000000 2003-01-01 0.14540200000000000 2004-01-01 0.40191100000000000 2005-01-01 0.35573499999999997 2006-01-01 0.32252500000000000 2007-01-01 0.28076400000000000 2008-01-01 0.24910200000000000 2009-01-01 0.26389900000000000 2010-01-01 0.23738600000000000 2011-01-01 0.20595100000000002 2012-01-01 0.58622900000000000 2013-01-01 1.64490999999999990 2014-01-01 1.85212000000000000 2015-01-01 1.69435999999999990 2016-01-01 1.57453000000000000