Year Percent 1994-01-01 12.8749000000000000 1995-01-01 22.6721000000000000 1996-01-01 18.8414000000000000 1997-01-01 10.5666000000000000 1998-01-01 7.7556199999999995 1999-01-01 4.5490100000000000 2000-01-01 2.9542700000000000 2001-01-01 3.0841800000000000 2002-01-01 3.5875500000000000 2003-01-01 4.2410900000000000 2004-01-01 7.0176300000000005 2005-01-01 6.1045099999999990 2006-01-01 5.4374699999999990 2007-01-01 5.1409699999999990 2008-01-01 5.0994500000000000 2009-01-01 9.1375200000000000 2010-01-01 8.9438100000000010 2011-01-01 6.4452400000000000 2012-01-01 13.9025000000000000 2013-01-01 13.6092000000000000 2014-01-01 25.8754000000000000 2015-01-01 25.1111000000000000 2016-01-01 25.2100000000000000