Year Percent 1996-01-01 0.79748200000000000 1997-01-01 0.51050800000000000 1998-01-01 0.44282299999999997 1999-01-01 0.51766200000000000 2000-01-01 0.36092800000000000 2001-01-01 0.20639000000000002 2002-01-01 1.54085000000000000 2003-01-01 1.31272000000000000 2004-01-01 1.42954000000000000 2005-01-01 1.12974000000000000 2006-01-01 1.03919000000000000 2007-01-01 0.39228700000000000 2008-01-01 0.34841800000000000 2009-01-01 0.45543100000000003 2010-01-01 0.40506600000000000 2011-01-01 0.33652700000000000 2012-01-01 0.34429400000000000 2013-01-01 0.33590700000000000 2014-01-01 0.15010000000000000 2015-01-01 0.12571400000000002 2016-01-01 0.11482900000000000