step_ahead,prediction
1,31.1732268768996
2,31.20922685813308
3,31.30231857017875
4,31.2906223959744
5,31.142876534166934
6,30.490460073447228
7,30.848800293496254
8,30.795681047075988
9,30.73656619423926
10,30.8534664699018
11,30.823945045220853
12,30.618988032203912
13,30.064937099015715
14,29.89670185816288
15,30.618703530669215
16,30.357845478448272
17,30.693710077255965
18,30.510800176995993
19,30.861783749336006
20,30.570510375636818
21,30.55797474628687
22,31.01160717481971
23,30.001461645495894
24,30.659071137315035
25,30.54668776256144
26,30.33885236673355
27,30.124271474641564
28,30.033743788772824
29,30.532401219445468
30,29.805064265072346