CREATE TABLE table_54512 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the attendance when Fitzroy played as the away team?
SELECT AVG("Crowd") FROM table_54512 WHERE "Away team" = 'fitzroy'
SELECT AVG("Crowd") FROM "table_54512" WHERE "Away team" = 'fitzroy'