Between the first and fifteenth days of December in each year the Chief Justice or, in his absence or inability to attend, the senior associate justice shall form a roster of the circuit judges of the several circuits in order to arrange a regular and continuous assignment and interchange of circuits among such judges and make an order assigning the several circuit judges to hold the several circuit courts in all of the circuits of the State for the whole of the succeeding year in such order as will effect a continuous interchange of circuits according to such numerical series.