Start of the period	End of the period	Due date
January	2011-01-01	2011-01-15	2011-01-25
	2011-01-16	2011-01-31	2011-02-10
February	2011-02-01	2011-02-15	2011-02-25
	2011-02-16	2011-02-28	2011-03-10
March	2011-03-01	2011-03-15	2011-03-25
	2011-03-16	2011-03-31	2011-04-11
April	2011-04-01	2011-04-15	2011-04-26
	2011-04-16	2011-04-30	2011-05-10
May	2011-05-01	2011-05-15	2011-05-25
	2011-05-16	2011-05-31	2011-06-10
June	2011-06-01	2011-06-15	2011-06-27
	2011-06-16	2011-06-30	2011-07-11
July	2011-07-01	2011-07-15	2011-07-25
	2011-07-16	2011-07-31	2011-08-10
August	2011-08-01	2011-08-15	2011-08-25
	2011-08-16	2011-08-31	2011-09-12
September	2011-09-01	2011-09-15	2011-09-26
	2011-09-16	2011-09-30	2011-10-11
October	2011-10-01	2011-10-15	2011-10-25
	2011-10-16	2011-10-31	2011-11-10
November	2011-11-01	2011-11-15	2011-11-25
	2011-11-16	2011-11-30	2011-12-12
December	2011-12-01	2011-12-15	2011-12-26
	2011-12-16	2011-12-31	2012-01-10