Suppose a firm has had the historical sales figures shown as follows. What would be the forecast for next years sales using the average approach?

\begin{tabular}{lccccc} Year & 2017 & 2018 & 2019 & 2020 & 2021 \\ Sales & $1,200,000 & $1,750,000 & $1,100,000 & $2,000,000 & $1,500,000 \end{tabular}