instruction: For those records from the products and each product's manufacturer, draw a bar chart about the distribution of headquarter and the average of manufacturer , and group by attribute headquarter, and order by the y-axis in descending.
response: SELECT Headquarter, AVG(Manufacturer) FROM Products AS T1 JOIN Manufacturers AS T2 ON T1.Manufacturer = T2.Code GROUP BY Headquarter ORDER BY AVG(Manufacturer) DESC