What was the year of the finish with the class pos of 6th and laps smaller than 317?
CREATE TABLE table_49216 (
    "Year" real,
    "Team" text,
    "Co-Drivers" text,
    "Class" text,
    "Laps" real,
    "Pos." text,
    "Class Pos." text
)
SELECT SUM("Year") FROM table_49216 WHERE "Class Pos." = '6th' AND "Laps" < '317'
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 was the year of the finish with the class pos of 6th and laps smaller than 317? ### Input: CREATE TABLE table_49216 (
    "Year" real,
    "Team" text,
    "Co-Drivers" text,
    "Class" text,
    "Laps" real,
    "Pos." text,
    "Class Pos." text
) ### Response: SELECT SUM("Year") FROM table_49216 WHERE "Class Pos." = '6th' AND "Laps" < '317'