step_ahead,prediction 1,12.129521518945694 2,15.542775613069534 3,16.919414651393893 4,17.057623553276063 5,14.160476335883141 6,14.467724826931953 7,16.33818382024765 8,17.302512598037723 9,17.87607231140137 10,17.731322968006136 11,15.236238676309585 12,18.15686172246933 13,13.161562439799308 14,16.542323189973832 15,16.730197930336