user: ### NOW ANSWER:
Question: Which Change is the average one that has a Centre of buenos aires, and a Rank smaller than 46?
Columns: ['Rank', 'Centre', 'Country', 'Rating', 'Change']
Types: ['real', 'text', 'text', 'real', 'real']
Sample row: [41.0, 'Isle of Man ( CD )', 'Isle of Man ( CD )', 638.0, 7.0]
SQL:

assistant: SELECT AVG("Change") FROM "Table" WHERE "Centre" = 'buenos aires' AND "Rank" < 46.0;