step_ahead,prediction
1,18.58747
2,18.877945
3,19.34548
4,19.82055
5,18.631819
6,19.336681
7,19.61387
8,19.201918
9,18.546968
10,19.670797
11,19.771132
12,19.358135
13,20.143642
14,19.495264
15,20.758266