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

### Instruction:
What is the percentage of the popular vote when there were 90 seats available?

### Inputs:
table_name: table, columns: ['Year of election', 'Candidates elected', '# of seats available', '# of votes', '% of popular vote']

### Response:
SELECT % of popular vote FROM table WHERE # of seats available = 90