step_ahead,prediction
1,12.998015
2,14.038909
3,13.438957
4,13.274341
5,13.482378
6,13.327191
7,13.767755
8,14.413126
9,13.663351
10,13.842082
11,14.008488
12,14.301383
13,14.307326
14,14.203568
15,14.403425