step_ahead,prediction
1,696.0937314033508
2,709.295257845521
3,696.4037958443165
4,703.8472266018391
5,696.155673635006
6,691.0440263926984
7,706.4763563811779
8,685.7011556297541
9,688.9898053109646
10,693.6212824970484
11,705.7919300496578
12,681.7522206008434
13,686.0456651329995
14,688.4201958537102
15,707.6819924414158