From the period between February 1, 2011 and February 18, 2011. 

From the period between December 24, 2010 and February 1, 2011.

From the period between December 11, 2010 and December 23, 2010. 

From the period between November 21, 2010 and December 10, 2010.

From the period between October 20, 2010 and November 20, 2010.

From the period between October 9, 2010 and October 19, 2010.

From the period between October 1, 2010 and October 8, 2010.

From the period between August 27, 2010 and September 30, 2010.

From the period between July 3, 2010 and August 26, 2010. 

From the period between June 18, 2010 and July 2, 2010.

From the period between February 17, 2010 and March 26, 2010.

From the period between January 26, 2010 and February 16, 2010.

From the period between December 15, 2009 and January 25, 2010.

From the period between November 4, 2009 and December 14, 2009.

From the period between October 6, 2009 and November 3, 2009.

From the period between September 12, 2009 and October 5, 2009.

From the period between August 7, 2009 and September 11, 2009.

From the period between July 1, 2009 and August 6, 2009.

From the period between May 19, 2009 and June 30, 2009.

From the period between April 21, 2009 and May 18, 2009.