Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_51 (reservation VARCHAR)
### Question:
What is the 1979 number for Standing Rock Indian Reservation when the 1989 is less than 54.9?
### Answer:
SELECT SUM(1979) FROM table_name_51 WHERE reservation = "standing rock indian reservation" AND 1989 < 54.9