In which years are co-stars mala sinha and amitabh bachchan?
CREATE TABLE table_27509 (
    "Song" text,
    "Singer" text,
    "Co-Singers" text,
    "Music Director" text,
    "Lyricist" text,
    "Co-Stars" text,
    "Movie/Album" text,
    "Year" text,
    "Additional Info" text
)
SELECT "Year" FROM table_27509 WHERE "Co-Stars" = 'Mala Sinha and Amitabh Bachchan'
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: In which years are co-stars mala sinha and amitabh bachchan? ### Input: CREATE TABLE table_27509 (
    "Song" text,
    "Singer" text,
    "Co-Singers" text,
    "Music Director" text,
    "Lyricist" text,
    "Co-Stars" text,
    "Movie/Album" text,
    "Year" text,
    "Additional Info" text
) ### Response: SELECT "Year" FROM table_27509 WHERE "Co-Stars" = 'Mala Sinha and Amitabh Bachchan'