What year was there a category of Best Supporting Actress?
CREATE TABLE table_53499 (
    "Year" real,
    "Ceremony" text,
    "Category" text,
    "Nominee" text,
    "Result" text
)
SELECT SUM("Year") FROM table_53499 WHERE "Category" = 'best supporting actress'
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 there a category of Best Supporting Actress? ### Input: CREATE TABLE table_53499 (
    "Year" real,
    "Ceremony" text,
    "Category" text,
    "Nominee" text,
    "Result" text
) ### Response: SELECT SUM("Year") FROM table_53499 WHERE "Category" = 'best supporting actress'