Year Percent 2000-01-01 0.48364700000000005 2001-01-01 0.27217900000000000 2002-01-01 0.06336400000000000 2003-01-01 0.34831999999999996 2004-01-01 0.34831999999999996 2005-01-01 0.58784200000000000 2006-01-01 0.37383299999999997 2007-01-01 0.37383299999999997 2008-01-01 0.37383299999999997 2009-01-01 0.01713100000000000 2010-01-01 1.37992999999999990 2011-01-01 0.15690000000000000 2012-01-01 2.85550000000000000 2013-01-01 2.76774000000000030 2014-01-01 3.66701000000000000 2015-01-01 6.29604000000000050