step_ahead,prediction
1,8.552869672944206
2,6.781191480657996
3,7.992873447012145
4,7.280323540829842
5,7.804599684069503
6,8.598894243015852
7,8.308000463177887
8,9.077900586073438
9,8.088958044628363
10,8.444233354521879
11,8.715348748004722
12,9.63003217806114
13,9.368778655768907
14,8.962526665668554
15,8.849775656011134