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

### Instruction:
What is the 1979 number for Standing Rock Indian Reservation when the 1989 is less than 54.9?

### Inputs:
table_name: table, columns: ['Reservation', 'Location', '1969', '1979', '1989', '2000']

### Response:
SELECT SUM 1979 FROM table WHERE Reservation = standing rock indian reservation AND 1989 < 54.9