user: Question: What was the US Peak position of the film that peaked at #21 in the UK?
Columns: ['Film', 'Year', 'Score composer', 'U.K. peak position', 'U.S. peak position']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Dr. No ( soundtrack )', 1962.0, 'Monty Norman', '—', '—']
SQL:

assistant: SELECT "U.S. peak position" FROM "Table" WHERE "U.K. peak position" = '21';