CREATE TABLE table_55440 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What is the average amount of spectators when Essendon played as the home team?
SELECT AVG("Crowd") FROM table_55440 WHERE "Home team" = 'essendon'
SELECT AVG("Crowd") FROM "table_55440" WHERE "Home team" = 'essendon'