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 |
| --- | --- | --- | --- | --- | --- | --- |
| Collingwood | 21.23 (149) | Geelong | 11.13 (79) | Victoria Park | 49552.0 | 21 April 1973 |
| St Kilda | 12.9 (81) | Richmond | 17.8 (110) | Moorabbin Oval | 33022.0 | 21 April 1973 |
| North Melbourne | 11.18 (84) | Fitzroy | 10.18 (78) | Arden Street Oval | 18704.0 | 21 April 1973 |
| South Melbourne | 17.16 (118) | Footscray | 20.15 (135) | Lake Oval | 13199.0 | 23 April 1973 |
| Melbourne | 11.9 (75) | Carlton | 11.16 (82) | MCG | 49439.0 | 23 April 1973 |
| Hawthorn | 27.8 (170) | Essendon | 15.12 (102) | VFL Park | 32045.0 | 23 April 1973 |
Question:
When the Away team scored 20.15 (135) on the Date of 23 april 1973, how many people were in the crowd?
Answer:
13199.0