step_ahead,prediction
1,230.87978
2,229.564
3,228.91582
4,228.95111
5,230.24324
6,227.68579
7,227.52083
8,229.50163
9,228.51723
10,228.25838
11,227.9416
12,227.9687
13,226.64717
14,226.7099
15,227.97786
16,225.31847
17,229.39758
18,227.38126
19,228.40927
20,223.4756
21,225.49791
22,225.61836
23,225.75761
24,224.99168
25,222.60274
26,225.21165
27,225.83293
28,224.61133
29,224.72781
30,224.54631