December 2008 $15.14 January 2009 $ -16.6 February 2009 $81.4 March 2009 $34.50 April 2009 $38.77 May 2009 $ - 158.6 June 2009 $ - 40.05 July 2009 $122.45 August 2009 $ -2.6 September 2009 $ -12.18 October 2009 $127.94 October 2012 $15.94 October 2016 $5.26 November 2016 $8.55 December 2016 $8.38