What is the value of the Mean Average Deviation of the below forecast?

Month Actual Sales Forecast Sales

Jan$-18150155$

Feb$-18158170$

Mar$-18160161$

Apr$-18162162$

May$-18178175$

Jun$-18158160$

Jul$-18147165$

Aug$-18147166$

Sep$-18178171$

Oct$-18155168$

Nov$-18154158$

Dec$-18159150$

Jan$-19150145$

Feb$-19160159$

Mar$-19170165$