step_ahead,prediction
1,18.947691
2,19.91363
3,18.55595
4,19.429394
5,19.63655
6,19.341515
7,19.091558
8,19.29682
9,19.722162
10,19.07143
11,18.562323
12,19.287199
13,19.578516
14,19.735733
15,18.656952