Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the average rank of the airport in São Paulo with passengers totaling less than 18,795,596?

### Inputs:
table_name: table, columns: ['Rank', 'Location', 'Total Passengers', 'Annual change', 'Capacity in use']

### Response:
SELECT AVG Rank FROM table WHERE Location = são paulo AND Total Passengers < 18,795,596