In 1976, how many goals achieved by team 'BIR' in Division 'EW'?
year = 1976; BIR refers to tmID; Division 'EW' refers to divID = 'EW'; goals = G;
SELECT SUM(T2.G) FROM Teams AS T1 INNER JOIN Scoring AS T2 ON T1.tmID = T2.tmID AND T1.year = T2.year WHERE T1.divID = 'EW' AND T1.tmID = 'BIR' AND T1.year = 1976