user: Question: Which Nationality has a Fate of Sunk (mine), and a Tonnage (GRT) smaller than 2266?
Columns: ['Date', 'U-boat', 'Name', 'Nationality', 'Tonnage (GRT)', 'Fate']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['21 November 1939', 'U-21', 'HMSBelfast', 'UK', 11500.0, 'Damaged (mine)']
SQL:

assistant: SELECT "Nationality" FROM "Table" WHERE "Fate" = 'Sunk (mine)' AND "Tonnage (GRT)" < 2266.0;