CREATE TABLE table_80270 ("Year" FLOAT, "Men's singles" TEXT, "Women's singles" TEXT, "Men's doubles" TEXT, "Women's doubles" TEXT, "Mixed doubles" TEXT)

Give the earliest year that featured Pi Hongyan on women's singles.
SELECT MIN("Year") FROM table_80270 WHERE "Women's singles" = 'pi hongyan'
SELECT MIN("Year") FROM "table_80270" WHERE "Women's singles" = 'pi hongyan'