Year	Percent
1991-01-01	87.6351815338181
1992-01-01	85.9378555790225
1993-01-01	125.5548496275720
1994-01-01	133.7525268503030
1995-01-01	134.6722439630240
1996-01-01	128.7141821975670
1997-01-01	120.6993374641160
1998-01-01	140.0981122873800
1999-01-01	186.3198333877560
2000-01-01	236.9753102366810
2001-01-01	192.1670818172490
2002-01-01	175.1660240914150
2003-01-01	177.4434613694400
2004-01-01	189.3891813669540
2005-01-01	194.7358815380620
2006-01-01	187.9571505917260
2007-01-01	156.5777652480040
2008-01-01	163.0515869297080
2009-01-01	161.4098270408640
2010-01-01	165.2413317400210
2011-01-01	162.9495646598610
2012-01-01	159.1312152835720
2013-01-01	153.5806246116300
2014-01-01	161.6596543815440
2015-01-01	178.3624431691800
2016-01-01	148.3884824412870
2017-01-01	150.0217905739430