step_ahead,prediction
1,38.53459
2,36.12802
3,35.522434
4,38.240997
5,37.173244
6,36.65803
7,36.843624
8,35.560814
9,37.556396
10,37.317562
11,34.451702
12,36.472126
13,36.427265
14,36.78437
15,37.317673