Year Percent 1996-01-01 63.218300000000000 1997-01-01 35.490500000000000 1998-01-01 42.083500000000000 1999-01-01 22.907500000000000 2000-01-01 19.248200000000000 2001-01-01 18.500600000000000 2002-01-01 24.406000000000000 2003-01-01 35.984200000000000 2004-01-01 28.208300000000000 2005-01-01 13.653100000000000 2006-01-01 17.195999999999998 2007-01-01 19.015000000000000 2008-01-01 20.982000000000000 2009-01-01 27.385900000000000 2010-01-01 14.480300000000000 2011-01-01 33.194000000000000 2012-01-01 44.956100000000000 2013-01-01 39.836700000000000 2014-01-01 56.773000000000000 2015-01-01 0.928257000000000