step_ahead,prediction
1,225.66255
2,224.8979
3,224.79419
4,224.82681
5,226.21536
6,224.04944
7,225.66428
8,225.72076
9,224.1706
10,221.44914
11,222.24944
12,222.72665
13,223.22867
14,223.6965
15,222.70422