There has been coherent effort by various national agencies to educate and encourage reduction in energy consumption among Singapore household over the years. You have chosen to research on whether such campaign has found success among households living in 1-room and 2-room HDB flats. Use the relevant data below to answer the following questions and assume that today is 1st of August 2021.

Use a suitable method to forecast the average quarterly household town gas consumptions for every quarter up to 2022 Q2 and make a statement to conclude your research. You are required to show the essential steps in deriving the forecast and comment on any limitations of your technique.

(I have not been taught ARIMA. Is there any other ways we can get the answer, perhaps by simple linear regression/CMA?)

Year Quarter Average Quarterly Household Town Gas Consumption (Kwh)