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_49 (year INTEGER, rank VARCHAR, points VARCHAR, team VARCHAR)
### Question:
What is the earliest year with less than 45 points for Yamaha team in 21st rank?
### Answer:
SELECT MIN(year) FROM table_name_49 WHERE points < 45 AND team = "yamaha" AND rank = "21st"