Question: What is the average Year that has a Quantity of 10, and a GWR Numbers of 409, 290, 315, 317–321, 324, 333?
SQL: SELECT AVG("Year") FROM "2-16598740-1" WHERE "Quantity" = 10.0 AND "GWR Numbers" = '409, 290, 315, 317–321, 324, 333';