What is the average year for Maserati Straight-4 Engines?
CREATE TABLE table_70352 (
    "Year" real,
    "Entrant" text,
    "Chassis" text,
    "Engine" text,
    "Points" real
)
SELECT AVG("Year") FROM table_70352 WHERE "Engine" = 'maserati straight-4'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the average year for Maserati Straight-4 Engines? ### Input: CREATE TABLE table_70352 (
    "Year" real,
    "Entrant" text,
    "Chassis" text,
    "Engine" text,
    "Points" real
) ### Response: SELECT AVG("Year") FROM table_70352 WHERE "Engine" = 'maserati straight-4'