Question $2)(30$ points$)$ Table $2$ below displays the demand data for Black Plastic from Specialty Packaging Corporation. Black Plastic is one of the main inputs for recyclable containers. The demand listed is in thousand units $($e$.$g$.,$ demand in Year $1$ Quarter $1$ is $2,250,000$ units$).$

Table $2-$ Specialty Packaging Corporation Black Plastic Demand $($in Thousand units$)$

Please use the static method for forecasting the demand for years $6$ to $8.$ Assume a mixed form for the systematic component.