Year Percent 1995-01-01 385.73800000000006 1996-01-01 367.63599999999997 1997-01-01 357.78400000000000 1998-01-01 357.78400000000000 1999-01-01 377.59700000000000 2000-01-01 347.17400000000004 2001-01-01 333.70000000000000 2002-01-01 392.15700000000000 2003-01-01 376.82300000000004 2004-01-01 356.15500000000000 2005-01-01 289.59800000000000 2006-01-01 276.05100000000000 2007-01-01 264.26000000000000 2008-01-01 213.29500000000000 2009-01-01 226.00900000000001 2010-01-01 279.06300000000000 2011-01-01 243.32200000000000 2012-01-01 244.48000000000000 2013-01-01 215.00300000000000 2014-01-01 161.61400000000000 2015-01-01 144.11600000000000 2016-01-01 131.85299999999998