Year	Percent
1991-01-01	169.83300000000000
1992-01-01	158.50400000000000
1993-01-01	152.43500000000000
1994-01-01	152.19500000000000
1995-01-01	159.91899999999998
1996-01-01	160.90400000000000
1997-01-01	159.85399999999998
1998-01-01	186.75099999999998
1999-01-01	206.05200000000002
2000-01-01	214.04400000000000
2001-01-01	228.74900000000002
2002-01-01	232.01400000000000
2003-01-01	245.47400000000002
2004-01-01	251.10500000000000
2005-01-01	246.99500000000000
2006-01-01	255.63500000000000
2007-01-01	270.88700000000000
2008-01-01	294.62200000000000
2009-01-01	313.61800000000000
2010-01-01	311.69800000000000
2011-01-01	313.81800000000000
2012-01-01	322.23900000000003
2013-01-01	334.65200000000000
2014-01-01	345.29800000000000
2015-01-01	348.58000000000000
2016-01-01	362.19500000000000