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_90 (years VARCHAR, area VARCHAR, authority VARCHAR)
### Question:
What years is the private school in upper hutt?
### Answer:
SELECT years FROM table_name_90 WHERE area = "upper hutt" AND authority = "private"