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Figure 6: Results of exponential smoothing algorithm for review articles (Forecast ± 95% C.I). Number of articles will increase from 903 in 2015 to 1474 articles in 2036. Alpha parameter is 0.090 and beta parameter is 0.75, showing the forecast is based more on the recent data and trends. Gama parameter is zero, indicating the data and forecast are not influenced by the seasonal changes. Mean absolute scaled error (MASE) is 1.74 and symmetric mean absolute percentage error (SMAPE) is 0.10, indicating an acceptable level of forecast accuracy 
