Year	Percent
2000-01-01	75.2457480140150
2001-01-01	75.3342197761410
2002-01-01	75.7146193378452
2003-01-01	75.4770407762223
2004-01-01	75.9824208509205
2005-01-01	76.0611395911499
2006-01-01	76.4121856292766
2007-01-01	76.4802611496370
2008-01-01	76.5838368700386
2009-01-01	75.9680002041288
2010-01-01	76.4328678725655
2011-01-01	76.8405756563697
2012-01-01	77.0039914211046
2013-01-01	77.3048841504190
2014-01-01	78.3244231529071
2015-01-01	78.5340170263359
2016-01-01	78.8305753074255
2017-01-01	79.1104614155778