Year Percent 2008-01-01 100.0000 2009-01-01 88.6564 2010-01-01 90.5606 2011-01-01 85.8229 2012-01-01 85.5958 2013-01-01 81.6937 2014-01-01 82.2495 2015-01-01 90.3122 2016-01-01 92.3374