Using the data below, what is the value of the absolute percent error for week $4?$

$\backslash$table$[[$Week$,$Time Series Value,Forecast$],[1,4,],[2,7,7\mathrm{.}00],[3,5,6\mathrm{.}00],[4,4,3\mathrm{.}00],[5,3,2\mathrm{.}00]]$

Answer format: Number: Round to: $2$ decimal places.