step_ahead,prediction
1,78.91426201941032
2,77.94753742151727
3,78.01010873093611
4,78.43988448278763
5,78.8761348936506
6,76.50530925934737
7,77.63061181994549
8,77.51813274696087
9,77.77563479823793
10,77.2855142007383
11,77.67558041675551
12,76.74982787055144
13,75.9468848480077
14,75.90771273446286
15,76.11627097009023