Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.1308

Sec. 1308. On or before each May 1, the chief judge of each court of record in the county shall estimate the number of jurors that will be needed by their courts for a 1-year period beginning the following September. This estimate shall be entered on the record of the court, and a copy of the estimate shall be certified by the clerk of the court and delivered to the board. In making the estimate, the judge shall consider the number of names available for the period for which the estimate is made.