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

### Instruction:
How many tickets were there sold/available in Barcelona?

### Inputs:
table_name: table, columns: ['Venue', 'City', 'Tickets Sold / Available', 'Gross Revenue (1986)', 'Gross Revenue (2011)']

### Response:
SELECT Tickets Sold / Available FROM table WHERE City = barcelona