Year Percent 1991-01-01 0.22300000000000000 1992-01-01 0.24100000000000002 1993-01-01 0.34900000000000000 1994-01-01 0.48700000000000004 1995-01-01 0.53496199999999990 1996-01-01 0.62195200000000010 1997-01-01 0.62587500000000000 1998-01-01 0.66047900000000000 1999-01-01 0.69895100000000000 2000-01-01 0.77601100000000000 2001-01-01 0.80782000000000000 2002-01-01 0.83411600000000000 2003-01-01 0.91563600000000000 2004-01-01 1.08635000000000000 2005-01-01 1.17161000000000000 2006-01-01 1.30556000000000000 2007-01-01 1.74609000000000010 2008-01-01 1.69334000000000000 2009-01-01 1.71885000000000000 2010-01-01 1.81120999999999980 2011-01-01 1.62616000000000000 2012-01-01 1.65842000000000000 2013-01-01 1.52988000000000000 2014-01-01 1.43376000000000010 2015-01-01 1.46319000000000000 2016-01-01 1.42727999999999990