Year Number 2004-01-01 60.9850167457529 2005-01-01 71.9302208072499 2006-01-01 129.7470591035210 2007-01-01 169.7945116243790 2008-01-01 176.8959519826670 2009-01-01 176.0411489637930 2010-01-01 188.0860832863820 2011-01-01 212.4515153804510 2012-01-01 228.5874248054640 2013-01-01 327.0716768814390 2014-01-01 336.9874644206570