Upon motion of a party at any time after a deposit has been made, the court shall direct that the money not withdrawn be invested in certificates of deposit of federal and state banks and savings and loan associations, or in treasury bills, notes, or obligations of the federal government or any agency thereof, subject to reasonable terms and conditions. Interest earned or other increments derived from the investment shall be allocated, credited, and disbursed between the parties pro rata, in relation to the final award.