Year Percent 2004-01-01 15.0712000000000000 2005-01-01 19.4472000000000000 2006-01-01 18.9883000000000000 2007-01-01 18.5187000000000000 2008-01-01 8.4508600000000000 2009-01-01 -3.3777100000000000 2010-01-01 9.0914399999999990 2011-01-01 -2.4439200000000000 2012-01-01 -7.5845899999999995 2013-01-01 5.6372400000000000 2014-01-01 4.4713199999999995 2015-01-01 4.4713199999999995 2016-01-01 1.8658800000000000