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

### Instruction:
What broadcast dates have a weekly rank of 73?

### Inputs:
table_name: table, columns: ['#', 'Air Date', 'Timeslot', 'Rating', 'Share', '18-49', 'Viewers', 'Weekly Rank']

### Response:
SELECT COUNT Air Date FROM table WHERE Weekly Rank = 73