Year Percent 1995-01-01 11.6770000000000000 1996-01-01 19.5579000000000000 1997-01-01 9.0588400000000000 1998-01-01 11.8367000000000000 1999-01-01 7.6027800000000000 2000-01-01 25.6894000000000000 2001-01-01 16.7878000000000000 2002-01-01 21.0599000000000000 2003-01-01 21.4255000000000000 2004-01-01 35.7315000000000000 2005-01-01 22.1766000000000000 2006-01-01 39.9875000000000000 2007-01-01 31.4199000000000000 2008-01-01 10.3768000000000000 2009-01-01 16.0994000000000000 2010-01-01 13.6846000000000000 2011-01-01 3.3580200000000000 2012-01-01 4.7300300000000000 2013-01-01 4.4700300000000000 2014-01-01 2.1339500000000000 2015-01-01 2.6036799999999998 2016-01-01 3.8126800000000003