user: ### NOW ANSWER:
Question: What is the 2000 number when the 1969 is 54.3, and the 1979 is less than 48.4?
Columns: ['Reservation', 'Location', '1969', '1979', '1989', '2000']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['Navajo Indian Reservation', 'Arizona, New Mexico, and Utah', 62.1, 47.3, 54.2, 46.5]
SQL:

assistant: SELECT SUM("2000") FROM "Table" WHERE "1969" = 54.3 AND "1979" < 48.4;