In determining whether cause is established for entering into an additional franchise for the same line-make, the department shall consider the existing circumstances, including, but not limited to:
(1) The amount of business transacted by existing franchisees of the same line-make in that community;(2) Whether the franchisees of the same line-make in that community are making a good faith effort to sell the franchisor's product;(3) Investment necessarily made and obligations incurred by existing franchisees of the same line-make in the community in the performance of their part of their franchises;(4) The effect on the retail vehicle business as a whole in that community;(5) The general quality and reputation of existing franchisees in the community and their ability to provide consumer care and service; and(6) Whether it is injurious to the public interest for an additional franchise to be established.