Year Number 2004-01-01 28.5662 2005-01-01 28.5662 2006-01-01 28.5662 2007-01-01 28.5662 2008-01-01 28.5662 2009-01-01 28.5662 2010-01-01 28.5662 2011-01-01 28.5662 2012-01-01 28.4743 2013-01-01 27.3721 2014-01-01 25.4432 2015-01-01 25.2595 2016-01-01 24.9839