step_ahead,prediction
1,199.28757
2,201.6879
3,203.61224
4,193.67542
5,198.04344
6,194.94379
7,197.13094
8,194.08876
9,192.98775
10,194.03882
11,193.30986
12,191.83806
13,187.57657
14,191.42017
15,186.4064