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

### Instruction:
On what date was the lead 8.6%?

### Inputs:
table_name: table, columns: ['Date(s) conducted', 'Cons', 'Plaid Cymru', 'Lib Dem', 'UKIP', 'Green', 'Others', 'Lead']

### Response:
SELECT Date(s) conducted FROM table WHERE Lead = 8.6%