user: ### NOW ANSWER:
Question: What was oslo's population in 1960, with a population of 507467 in 2000?
Columns: ['Rank', 'County', 'Population (1960)', 'Population (2000)', 'Population (2040)']
Types: ['text', 'text', 'real', 'real', 'real']
Sample row: ['1', 'Oslo', 471511.0, 507467.0, 823549.0]
SQL:

assistant: SELECT AVG("Population (1960)") FROM "Table" WHERE "County" = 'oslo' AND "Population (2000)" > 507467.0;