user: Question: How many times did the team achieve an overrall record of MU, 21-19?
Columns: ['Missouri vs.', 'Overall Record', 'at Columbia', 'at Opponents Venue', 'at Neutral Site', 'Last 5 Meetings', 'Last 10 Meetings', 'Current Streak']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Colorado', 'MU, 99-53', 'MU, 57-11', 'CU, 34-30', 'MU, 12-8', 'MU, 4-1', 'MU, 9-1', 'W 1']
SQL:

assistant: SELECT COUNT("Last 5 Meetings") FROM "Table" WHERE "Overall Record" = 'MU, 21-19';