The Board of Supervisors shall, by ordinance, provide for the format of a voters' pamphlet including a sample ballot, candidates' statements, lists of sponsors, arguments for and against each ballot measure, any financial impact statements prepared by the Controller, and arguments for and against the recall of any officers. The voters' pamphlet shall be mailed to each elector so as to be received at least ten days prior to each general, runoff or special municipal election.