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 |
| --- | --- | --- | --- | --- | --- | --- |
| Geelong | 16.11 (107) | Melbourne | 5.16 (46) | Kardinia Park | 15000.0 | 12 July 1947 |
| Essendon | 10.18 (78) | Footscray | 8.11 (59) | Windy Hill | 20000.0 | 12 July 1947 |
| Collingwood | 8.17 (65) | Hawthorn | 6.9 (45) | Victoria Park | 12000.0 | 12 July 1947 |
| Carlton | 10.14 (74) | South Melbourne | 9.16 (70) | Princes Park | 28000.0 | 12 July 1947 |
| St Kilda | 8.15 (63) | North Melbourne | 13.25 (103) | Junction Oval | 6000.0 | 12 July 1947 |
| Richmond | 12.12 (84) | Fitzroy | 11.12 (78) | Punt Road Oval | 28000.0 | 12 July 1947 |
Question:
What is the lowest crowd at windy hill?
Answer:
20000.0