user: Question: What is the highest population for the province having a rank under 5?
Columns: ['Year', 'Population', 'Five Year % change', 'Ten Year % change', 'Rank Among Provinces']
Types: ['real', 'real', 'text', 'text', 'real']
Sample row: [1871.0, 25228.0, 'n/a', 'n/a', 6.0]
SQL:

assistant: SELECT MAX("Population") FROM "Table" WHERE "Rank Among Provinces" < 5.0;