CREATE TABLE table_33580 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What is the smallest crowd when richmond is away?
SELECT MIN("Crowd") FROM table_33580 WHERE "Away team" = 'richmond'
SELECT MIN("Crowd") FROM "table_33580" WHERE "Away team" = 'richmond'