step_ahead,prediction
1,15.306939973861107
2,15.474005411962779
3,15.802872894091578
4,15.805274245994092
5,16.022610999424018
6,15.551439948821239
7,15.838945530837437
8,15.710475217830256
9,16.44543884895029
10,16.10636585359472
11,15.854371064475172
12,15.79134603318526
13,16.286555852481598
14,16.041531830721944
15,15.800068167117841