user: Question: What is the highest tonnage of the ship from Norway?
Columns: ['Date', 'Ship', 'Nationality', 'Tonnage', 'Fate']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['29 June 1941', 'George J. Goulandris', 'Greece', 4345.0, 'Sunk']
SQL:

assistant: SELECT MAX("Tonnage") FROM "Table" WHERE "Nationality" = 'Norway';