CREATE TABLE table_51981 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the crowd size for the away team footscray?
SELECT "Crowd" FROM table_51981 WHERE "Away team" = 'footscray'
SELECT "Crowd" FROM "table_51981" WHERE "Away team" = 'footscray'