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

### Instruction:
How many times did the team achieve an overrall record of mu, 21-19?

### Inputs:
table_name: table, columns: ['Missouri vs.', 'Overall Record', 'at Columbia', 'at Opponents Venue', 'at Neutral Site', 'Last 5 Meetings', 'Last 10 Meetings', 'Current Streak']

### Response:
SELECT COUNT Last 5 Meetings FROM table WHERE Overall Record = MU, 21-19