Give the earliest year that featured Pi Hongyan on women's singles.
CREATE TABLE table_80270 (
    "Year" real,
    "Men's singles" text,
    "Women's singles" text,
    "Men's doubles" text,
    "Women's doubles" text,
    "Mixed doubles" text
)
SELECT MIN("Year") FROM table_80270 WHERE "Women's singles" = 'pi hongyan'
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: Give the earliest year that featured Pi Hongyan on women's singles. ### Input: CREATE TABLE table_80270 (
    "Year" real,
    "Men's singles" text,
    "Women's singles" text,
    "Men's doubles" text,
    "Women's doubles" text,
    "Mixed doubles" text
) ### Response: SELECT MIN("Year") FROM table_80270 WHERE "Women's singles" = 'pi hongyan'