step_ahead,prediction
1,203.74281320273877
2,204.01307879686357
3,204.72655622065068
4,203.2361182153225
5,203.36149024367333
6,203.50867347717286
7,203.61245478689673
8,203.75276901721955
9,203.80702566206458
10,203.8353836208582
11,203.07875868082047
12,204.00034146010879
13,202.70866357386114
14,204.90396306812764
15,203.8214420884848