i) The monthly (or whatever period the futures contract is specified in) listed price of each of the four contracts for a period of 12 months.
ii) The monthly spot prices for each of the underlying four commodities concerned.
Compare the spot prices with the futures prices, and comment on the comparison / offer explanations for divergence.
(Compare between the 2 futures prices above by giving more information about why the price moved up or down, the comment on the effect on the change of spot in the future price).