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

### Instruction:
when did the institution at chapel hill, North carolina join acc?

### Inputs:
table_name: table, columns: ['Institution', 'Nickname', 'Location', 'Founded', 'Joined ACC', 'School Type', 'ACC Football Titles']

### Response:
SELECT Joined ACC FROM table WHERE Location = Chapel Hill, North Carolina