Year Number 2007-01-01 250.1940 2008-01-01 259.3755 2009-01-01 255.9496 2010-01-01 255.8109 2011-01-01 264.7556 2012-01-01 275.0667 2013-01-01 295.3260 2014-01-01 285.9388 2015-01-01 286.8926 2016-01-01 292.1803 2017-01-01 295.9247