user: Question: Which average Crowd has a Home team of Essendon?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Hawthorn', '21.17 (143)', 'St Kilda', '16.13 (109)', 'Princes Park', 11686.0, '21 June 1980']
SQL:

assistant: SELECT AVG("Crowd") FROM "Table" WHERE "Home team" = 'Essendon';