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

### Instruction:
what's the percentage of votes with election date being 1981

### Inputs:
table_name: table, columns: ['Election date', 'Party leader', 'Number of votes received', 'Percentage of votes', 'Number of deputies']

### Response:
SELECT Percentage of votes FROM table WHERE Election date = 1981