What year was a Rial Arc2 chassis used?
CREATE TABLE table_68627 (
    "Year" real,
    "Team" text,
    "Chassis" text,
    "Engine" text,
    "Points" real
)
SELECT SUM("Year") FROM table_68627 WHERE "Chassis" = 'rial arc2'
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 was a Rial Arc2 chassis used? ### Input: CREATE TABLE table_68627 (
    "Year" real,
    "Team" text,
    "Chassis" text,
    "Engine" text,
    "Points" real
) ### Response: SELECT SUM("Year") FROM table_68627 WHERE "Chassis" = 'rial arc2'