Year Percent 2000-01-01 6.60000 2001-01-01 8.60000 2002-01-01 12.80000 2003-01-01 13.90000 2004-01-01 16.00000 2005-01-01 14.10000 2006-01-01 10.70000 2007-01-01 7.60000 2008-01-01 8.50000 2009-01-01 7.20000 2010-01-01 3.15901 2011-01-01 2.77846 2012-01-01 2.54981 2013-01-01 2.74240 2014-01-01 4.06703 2015-01-01 5.25920 2016-01-01 6.64629