(1) The lessee shall pay an annual rental to the state. The rental for the first year shall be at least $1.00 per acre and may include an additional amount per acre as a bonus determined by the board. The rental for the second and third year shall be $1.00 per acre. The rental for the fourth and fifth year shall be $2.50 per acre and the rental thereafter, until the lease terminates, shall be $3.00 per acre. In no case shall the total rental for one lease be less than $100.00 per year.