What is the ratio number of territories in Northern region and number territories in Western region?
Northern region refers to RegionID = 3; Western region refers to RegionID = 2 ; ratio = divide((TerritoryDescription where RegionID = 3), (TerritoryDescription where RegionID = 2))
SELECT CAST(( SELECT COUNT(T1.TerritoryID) FROM Territories AS T1 INNER JOIN Region AS T2 ON T1.RegionID = T2.RegionID WHERE T2.RegionDescription = 'Northern' ) AS REAL) * 100 / ( SELECT COUNT(T1.TerritoryID) FROM Territories AS T1 INNER JOIN Region AS T2 ON T1.RegionID = T2.RegionID WHERE T2.RegionDescription = 'Westerns' ) AS Calu