Year Percent 1997-01-01 0.3670880000000000 1998-01-01 0.4208820000000000 1999-01-01 0.4159650000000000 2000-01-01 0.4159650000000000 2001-01-01 0.8565370000000001 2002-01-01 1.0645500000000000 2003-01-01 2.8867100000000000 2004-01-01 7.6199200000000000 2005-01-01 7.5745500000000000 2006-01-01 4.9159700000000000 2007-01-01 4.9159700000000000 2008-01-01 4.9159700000000000 2009-01-01 0.2694640000000000 2010-01-01 0.1708500000000000 2011-01-01 0.1796940000000000 2012-01-01 0.4036970000000000 2013-01-01 0.0719060000000000 2014-01-01 0.0733720000000000 2015-01-01 0.0916570000000000