The index value at month t is defined as P(t). Monthly return in month t is given by: (P(t)-P(t1))/P(t-1).

Compute for each month then the average over a 1 year period. State the price series you have used along with how you computed the returns, as there are closing and opening prices.

Date	Open	High	Low	Close	Volume
1/10/16	5525.2002	5578.8999	5347.29981	5402.3999	15198480400
1/11/16	5402.3999	5583.5	5138.8999	5502.3999	18827057200
1/12/16	5502.3999	5746.7002	5443.5	5719.1001	15862784600
1/1/17	5720.7002	5876.79981	5661.2002	5675	13557800800
1/2/17	5675	5880.8999	5635.1001	5761	17390206600
1/3/17	5761	5937.2002	5724.1001	5903.79981	20191684500
1/4/17	5903.79981	5983.2002	5826.7002	5947.6001	13914426600
1/5/17	5947.6001	5976.3999	5720.5	5761.29981	19761002700
1/6/17	5761.29981	5863.79981	5670.7002	5764	19162785000
1/7/17	5764	5846.2002	5705.6001	5773.8999	16497542700
1/8/17	5773.8999	5852.7002	5711.7002	5776.29981	19994391200
1/9/17	5776.29981	5835.7002	5702.2002	5744.8999	15795779200
1/10/17	5744.8999	6003.2002	5717.7002	5976.3999	16222442900