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 | 9.18 (72) | North Melbourne | 13.10 (88) | Western Oval | 18269.0 | 13 April 1968 |
| Essendon | 26.16 (172) | Hawthorn | 15.9 (99) | Windy Hill | 17000.0 | 13 April 1968 |
| Collingwood | 10.12 (72) | Richmond | 11.22 (88) | Victoria Park | 37018.0 | 13 April 1968 |
| Carlton | 13.22 (100) | Geelong | 7.12 (54) | Princes Park | 30158.0 | 13 April 1968 |
| South Melbourne | 18.17 (125) | St Kilda | 13.22 (100) | Lake Oval | 23675.0 | 13 April 1968 |
| Melbourne | 14.10 (94) | Fitzroy | 12.18 (90) | MCG | 24991.0 | 13 April 1968 |
Question:
When did the game with North Melbourne as the away team take place?
Answer:
13 April 1968