11th April 2011 to 24th April 2011,5.20%,
25th April 2011 to 24th May 2011,4.77%,
25th May 2011 to 24th June 2011,4.33%,
25th June 2011 to 24th July 2011,3.90%,
25th July 2011 to 24th August 2011,3.47%,
25th August 2011 to 24th September 2011,3.03%,
25th September 2011 to 24th October 2011,2.60%,
25th October 2011 to 24th November 2011,2.17%,
25th November 2011 to 24th December 2011,1.73%,
25th December 2011 to 24th January 2012,1.30%,
25th January 2012 to 24th February 2012,0.87%,
25th February 2012 to 24th March 2012,0.43%,