Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which Staying councillors have a New council of 7, and a Previous council larger than 8?

### Inputs:
table_name: table, columns: ['Party', 'Previous council', 'Staying councillors', 'Seats up for election', 'Election result', 'New council']

### Response:
SELECT AVG Staying councillors FROM table WHERE New council = 7 AND Previous council > 8