Year Percent 2007-01-01 2.98 2008-01-01 2.98 2009-01-01 2.98 2010-01-01 2.98 2011-01-01 2.98 2012-01-01 2.61 2013-01-01 2.55 2014-01-01 2.54 2015-01-01 3.24 2016-01-01 3.91