Please Help me with this question:

Suppose that you observe the monthly data given below for the spot prices of a commodity you plan to sell 500,000 units of in a month from today and the futures price of another commodity you plan to use as a hedge instrument. if each futures contract is on 50,000 units of the commodity that is used as the hedge instrument, what futures position should you take to optimally hedge your exposure?

	jan	feb	mar	april	may	june	july	aug	sept	oct	nov
St	20.0	19.70	20.27	20.67	20.83	21.13	21.32	21.31	21.78	21.97	22.04
Ft	31.08	31.14	31.33	31.54	32.51	33.15	32.70	32.17	33.14	33.75	34.40