(a) If a municipality desires to increase its corporate limits by making a minor boundary adjustment, the governing body of the municipality may apply to the county commission of the county wherein the municipality or the major portion of the territory thereof, including the territory to be annexed, is located for permission to effect annexation by minor boundary adjustment. The municipality shall pay the costs of all proceedings before the commission: Provided, That:
(1) A minor boundary adjustment may not exceed 105 percent of the existing total municipal boundary;