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_15 (number_1971 INTEGER)
### Question:
What is the lowest 1971 number of the Macedonian population with a 2002 value greater than 133 and a 1991 value less than 171?
### Answer:
SELECT MIN(number_1971) FROM table_name_15 WHERE 2002 > 133 AND 1991 < 171