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_19 (year INTEGER, chassis VARCHAR)
### Question:
What is the year of the Lotus 25 chassis?
### Answer:
SELECT AVG(year) FROM table_name_19 WHERE chassis = "lotus 25"