1. Jun 2012 May 2012 Apr 2012 Mar 2012 Feb 2012 Jan 2012 Dec 2011 Nov 2011 Oct 2011 Sep 2011 Aug 2011 Jul 2011 Jun 2011 May 2011 Apr 2011 Mar 2011 Feb 2011 Jan 2011 Dec 2010 Nov 2010 Oct 2010 Sep 2010 Aug 2010 Jul 2010 Jun 2010 May 2010 Apr 2010 Mar 2010 Feb 2010 Jan 2010 Dec 2009 Nov 2009 Oct 2009 Sep 2009 Aug 2009 Jul 2009 Jun 2009 May 2009 Apr 2009 Mar 2009 Feb 2009 Jan 2009 Dec 2008 Nov 2008 Oct 2008 Sep 2008 Aug 2008 Jul 2008 Jun 2008 May 2008 Apr 2008 Mar 2008 Feb 2008 Jan 2008

  2. 48.74 USD 48.74 USD 63.28 USD 63.28 USD 64.39 USD 64.39 USD 54.59 USD 54.59 USD 70.47 USD 70.47 USD 56.25 USD 56.25 USD 53.02 USD 53.02 USD 48.99 USD 48.99 USD 45.61 USD 45.61 USD 62.12 USD 62.12 USD 40.48 USD 40.48 USD 62.44 USD 62.44 USD 47.20 USD 47.20 USD 57.52 USD 57.52 USD 78.40 USD 78.40 USD 67.36 USD 67.36 USD 55.05 USD 55.05 USD 61.50 USD 61.50 USD 60.09 USD 60.09 USD 72.14 USD 72.14 USD 28.91 USD 28.91 USD 62.44 USD 62.44 USD 45.49 USD 45.49 USD 60.31 USD 60.31 USD 63.63 USD 63.63 USD 48.38 USD 48.38 USD 60.67 USD 60.67 USD 55.77 USD 55.77 USD 72.99 USD 72.99 USD 55.37 USD 55.37 USD 53.39 USD 53.39 USD 49.81 USD 49.81 USD 52.64 USD 52.64 USD 45.86 USD 45.86 USD 52.26 USD 52.26 USD 64.23 USD 64.23 USD 51.53 USD 51.53 USD 53.03 USD 53.03 USD 57.49 USD 57.49 USD 56.04 USD 56.04 USD 60.30 USD 60.30 USD 44.92 USD 44.92 USD 63.23 USD 63.23 USD 57.49 USD 57.49 USD 41.56 USD 41.56 USD 78.64 USD 78.64 USD 63.81 USD 63.81 USD 60.49 USD 60.49 USD 64.47 USD 64.47 USD 58.34 USD 58.34 USD 67.89 USD 67.89 USD 67.47 USD 67.47 USD 47.85 USD 47.85 USD