Year	Percent
1991-01-01	163.94299999999998
1992-01-01	152.64900000000000
1993-01-01	146.26400000000000
1994-01-01	145.98500000000000
1995-01-01	153.69000000000000
1996-01-01	154.93400000000000
1997-01-01	154.14200000000000
1998-01-01	180.49900000000002
1999-01-01	199.01100000000000
2000-01-01	206.94400000000002
2001-01-01	221.38099999999997
2002-01-01	223.72500000000000
2003-01-01	235.95700000000000
2004-01-01	240.95000000000000
2005-01-01	237.00400000000002
2006-01-01	245.91700000000000
2007-01-01	261.65500000000000
2008-01-01	284.98400000000004
2009-01-01	302.74000000000000
2010-01-01	300.18100000000000
2011-01-01	301.75200000000000
2012-01-01	309.31000000000000
2013-01-01	320.76599999999996
2014-01-01	331.10600000000000
2015-01-01	334.55100000000000
2016-01-01	347.38699999999994