Year Percent 1993-01-01 0.5263180000000001 1994-01-01 0.4621340000000000 1995-01-01 0.4094030000000000 1996-01-01 0.3062230000000000 1997-01-01 0.9780719999999999 1998-01-01 0.7733770000000001 1999-01-01 0.8188439999999999 2000-01-01 0.7776480000000000 2001-01-01 2.5397300000000000 2002-01-01 2.2862200000000000 2003-01-01 3.5359500000000000 2004-01-01 5.0281100000000000 2005-01-01 4.4282900000000005 2006-01-01 3.9859400000000003 2007-01-01 3.0926500000000000 2008-01-01 2.6956700000000002 2009-01-01 2.7958900000000000 2010-01-01 2.5520900000000000 2011-01-01 1.5318500000000000 2012-01-01 3.2348700000000000 2013-01-01 4.8838400000000000 2014-01-01 4.8192900000000005 2015-01-01 4.4379900000000000 2016-01-01 5.1335600000000000