A small company is a selling a new board game, and they need to know how many to produce in the future After 12 months , they sold 4 thousand games , after 18 months they sold 7 thousand games , an

A small company is a selling a new board game, and they need to know how many to produce in the future 

After 12 months , they sold 4 thousand games , after 18 months they sold 7 thousand games , and after 36 months they sold 16 thousand games. 

Could this information be reasonably estimated using a single linear model ?

If so use the model to estimate the number of games sold after 48 months . If not explain your reasoning