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

### Instruction:
How much Average has a Team of san lorenzo, and a 1990-1991 smaller than 45?

### Inputs:
table_name: table, columns: ['Team', 'Average', 'Points', 'Played', '1988-89', '1989-90', '1990-1991']

### Response:
SELECT COUNT Average FROM table WHERE Team = san lorenzo AND 1990-1991 < 45