Year	Percent
2000-01-01	77.1548674285406
2001-01-01	77.2004190421602
2002-01-01	77.9456942777546
2003-01-01	78.1244761302045
2004-01-01	78.4807238792400
2005-01-01	78.2623696916719
2006-01-01	77.9254198391697
2007-01-01	77.9090229208917
2008-01-01	77.4407642291721
2009-01-01	76.9660287646012
2010-01-01	77.1584061948162
2011-01-01	77.4589412061130
2012-01-01	77.7321686121327
2013-01-01	77.8198710149205
2014-01-01	78.8540983333183
2015-01-01	78.8808253766166
2016-01-01	78.9272765420038
2017-01-01	79.3175324425101