What year did Elf Team Tyrrell have 39 points and a Tyrrell 007 Chassis?
CREATE TABLE table_15840 (
    "Year" real,
    "Entrant" text,
    "Chassis" text,
    "Engine" text,
    "Points" text
)
SELECT SUM("Year") FROM table_15840 WHERE "Entrant" = 'elf team tyrrell' AND "Points" = '39' AND "Chassis" = 'tyrrell 007'
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 year did Elf Team Tyrrell have 39 points and a Tyrrell 007 Chassis? ### Input: CREATE TABLE table_15840 (
    "Year" real,
    "Entrant" text,
    "Chassis" text,
    "Engine" text,
    "Points" text
) ### Response: SELECT SUM("Year") FROM table_15840 WHERE "Entrant" = 'elf team tyrrell' AND "Points" = '39' AND "Chassis" = 'tyrrell 007'