A forecasting method has produced the following over the past five months. What is the mean absolute percentage error $($MAPE$)?$

$\backslash$table$[[$Actual$,$Forecast$],[11,13],[5,10],[11,8],[7,6],[13,8]]$

A$.0\mathrm{.}00\%$

B$.$ cannot be calculated with the information given

C$.34\mathrm{.}04\%$

D$.39\mathrm{.}64\%$

E$.31\mathrm{.}87\%$