CREATE TABLE table_51376 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the lowest crowd size when Carlton was the away team.
SELECT MIN("Crowd") FROM table_51376 WHERE "Away team" = 'carlton'
SELECT MIN("Crowd") FROM "table_51376" WHERE "Away team" = 'carlton'