Year Percent 1995-01-01 52.560600000000000 1996-01-01 49.554800000000000 1997-01-01 51.305800000000000 1998-01-01 60.234700000000000 1999-01-01 35.302300000000000 2000-01-01 30.193700000000000 2001-01-01 30.285500000000000 2002-01-01 30.642900000000000 2003-01-01 3.054150000000000 2004-01-01 2.709230000000000 2005-01-01 2.377190000000000 2006-01-01 19.432000000000002 2007-01-01 18.756700000000000 2008-01-01 12.395000000000000 2009-01-01 22.385100000000000 2010-01-01 39.925900000000000 2011-01-01 24.004800000000000 2012-01-01 13.131300000000000 2013-01-01 7.780460000000001 2014-01-01 6.438269999999999 2015-01-01 11.707500000000000 2016-01-01 9.036870000000000