Year Percent 1996-01-01 46.5995000000000000 1997-01-01 36.6869000000000000 1998-01-01 37.1668000000000000 1999-01-01 21.3132000000000000 2000-01-01 2.2559099999999996 2001-01-01 45.1837000000000000 2002-01-01 45.1837000000000000 2003-01-01 45.1837000000000000 2004-01-01 45.1837000000000000 2005-01-01 58.0641000000000000 2006-01-01 35.6349000000000000 2007-01-01 54.6036000000000000 2008-01-01 34.8666000000000000 2009-01-01 33.2705000000000000 2010-01-01 31.3879000000000000 2011-01-01 34.8152000000000000 2012-01-01 31.3911000000000000 2013-01-01 23.2566000000000000 2014-01-01 27.7111000000000000 2015-01-01 20.2376000000000000 2016-01-01 24.2593000000000000