Year Percent 1991-01-01 0.47198599999999996 1992-01-01 0.28570600000000000 1993-01-01 0.21564699999999998 1994-01-01 0.23371999999999998 1995-01-01 0.19440200000000000 1996-01-01 0.19059900000000000 1997-01-01 0.59428000000000000 1998-01-01 0.95912400000000000 1999-01-01 0.70024200000000000 2000-01-01 0.91192099999999990 2001-01-01 0.93243099999999990 2002-01-01 13.17170000000000000 2003-01-01 15.82720000000000000 2004-01-01 6.05920000000000000 2005-01-01 4.19106000000000000 2006-01-01 12.86240000000000000 2007-01-01 14.85660000000000000 2008-01-01 5.41413000000000000 2009-01-01 2.24795000000000000 2010-01-01 0.72985400000000000 2011-01-01 1.59914000000000000 2012-01-01 1.44303000000000000 2013-01-01 0.24344100000000000 2014-01-01 0.16350599999999998