b$)$ Using a $3-$year weighted moving average in which the registrations in the most recent year are given a weight of $2,$ and registrations in the other $2$ years are each given a weight of $1,$ the forecasted registrations $($in thousands$)$ for years $4$ through $12$ are $($round your responses to one decimal place$)$:

$\backslash$table$[[$Year$,4,5,6,7,8,9,10,11,12],[$Forecast$,a,,,,,,,,]]$