Please help me with this. And Please show the formula so that I could understand your work.

12.10. Globetron manufactures components for use in small electronic products such as computers, DVD players, and radios at plants in Belgium, Germany, and France. The parts are transported by truck to Hamburg, where they are shipped overseas to customers in North America, South America, and the Pacific Rim. The company has to reserve space on ships, months and sometimes years in advance, and as such needs an accurate forecasting model. Following are the number of cubic feet of container space the company has used in each of the past 18 months. Month Space (1000s ft) Month Space (1000s ft) Month Space (1000s ft) 1 10.6 7 12.2 18.2 13 2 12.7 8 16.7 14 19.6 3 9.8 9 18.1 15 21.4 4 11.3 10 19.2 16 22.8 5 13.6 11 16.3 17 20.6 6 14.4 12 14.7 18 18.7 Develop a forecasting model that you believe would provide the company with relatively accurate forecasts for the next year and indicate the forecasted shipping space required for the next three months