Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Home team | Home team score | Away team | Away team score | Venue | Crowd | Date |
| --- | --- | --- | --- | --- | --- | --- |
| Footscray | 20.14 (134) | South Melbourne | 14.11 (95) | Western Oval | 22580.0 | 17 April 1976 |
| Hawthorn | 25.22 (172) | Collingwood | 12.12 (84) | Princes Park | 23375.0 | 17 April 1976 |
| Carlton | 14.13 (97) | Fitzroy | 6.12 (48) | VFL Park | 32648.0 | 17 April 1976 |
| Essendon | 15.8 (98) | Melbourne | 20.13 (133) | Windy Hill | 21167.0 | 19 April 1976 |
| Richmond | 14.18 (102) | North Melbourne | 12.11 (83) | MCG | 41413.0 | 19 April 1976 |
| St Kilda | 16.10 (106) | Geelong | 12.14 (86) | Moorabbin Oval | 26931.0 | 19 April 1976 |
Question:
What's the average crowd size when the venue is western oval?
Answer:
22580.0