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

### Instruction:
In what year was the NFL team in chicago illinois established?

### Inputs:
table_name: table, columns: ['Team', 'City', 'State/Province', 'League', 'Est.']

### Response:
SELECT Est. FROM table WHERE State/Province = illinois AND City = chicago AND League = nfl