Table 1: Comparison among the Elman, ELM, and GA-ELM models.

Prediction method	MAPE	RMSE	MAXERROR
Elman	11.0096	2.1819	13.2566
ELM	15.5132	2.9079	18.0702
GA-ELM	6.0790	1.4799	11.1989