step_ahead,prediction
1,164.07222835719585
2,165.57386910915375
3,164.29421401023865
4,164.4546074271202
5,164.41074660420418
6,168.09712404757738
7,164.46869070082903
8,167.41363315284252
9,167.24141186475754
10,167.0321895033121
11,167.17497622966766
12,167.4742899686098
13,162.45714189857244
14,172.37356467545033
15,170.792600274086