Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_31 ( change INTEGER, centre VARCHAR, rank VARCHAR )

### Question ###
Which Change is the average one that has a Centre of buenos aires, and a Rank smaller than 46?

### Accurate SQL ###

SELECT AVG(change) FROM table_name_31 WHERE centre = "buenos aires" AND rank < 46