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

### Instruction:
Matches of 15, and a Win % smaller than 20 had what highest lost?

### Inputs:
table_name: table, columns: ['Nationality', 'Matches', 'Drawn', 'Lost', 'Win %']

### Response:
SELECT MAX Lost FROM table WHERE Matches = 15 AND Win % < 20