Year	Percent
2005-01-01	92.7002938627924
2006-01-01	92.7399149023403
2007-01-01	92.6518987477429
2008-01-01	91.9258769243673
2009-01-01	90.2113798357314
2010-01-01	89.8055716478161
2011-01-01	90.0594208835927
2012-01-01	90.5549439326631
2013-01-01	90.3130947551464
2014-01-01	90.3420570028183
2015-01-01	90.7897287080950
2016-01-01	91.0652770678872
2017-01-01	91.5569605038326