user: Question: What is the highest population of England and Wales that has less than 50 Muslims?
Columns: ['Census Year', "Number of Muslims '000", "Population of England and Wales '000", 'Muslim (% of Total population)', 'Registered Mosques', 'Muslims per mosque']
Types: ['real', 'real', 'real', 'real', 'real', 'real']
Sample row: [1961.0, 50.0, 46196.0, 0.11, 7.0, 7143.0]
SQL:

assistant: SELECT MAX("Population of England and Wales '000") FROM "Table" WHERE "Number of Muslims '000" < 50.0;