user: Question: What is the maximum 2006 census population of LGA name Opobo/Nkoro?
Columns: ['LGA Name', 'Area (km 2 )', 'Census 2006 population', 'Administrative capital', 'Postal Code']
Types: ['text', 'real', 'real', 'text', 'real']
Sample row: ['Port Harcourt', 109.0, 541115.0, 'Port Harcourt', 500.0]
SQL:

assistant: SELECT MAX("Census 2006 population") FROM "Table" WHERE "LGA Name" = 'Opobo/Nkoro';