How many canned A&W were purchased in 2016?
canned refers to ContainerType = 'Can'; A&W refers to BrandName = 'A&W'; in 2016 refers to PurchaseDate > = '2016-01-01' AND PurchaseDate < = '2016-12-31';
SELECT COUNT(T1.BrandID) FROM rootbeer AS T1 INNER JOIN rootbeerbrand AS T2 ON T1.BrandID = T2.BrandID WHERE T1.ContainerType = 'Can' AND T2.BrandName = 'A&W' AND T1.PurchaseDate LIKE '2016%'