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_60 (year INTEGER, number_in_entourage VARCHAR, mission_type VARCHAR)
### Question:
What is the latest year of a gratitude type mission with 99 in the entourage?
### Answer:
SELECT MAX(year) FROM table_name_60 WHERE number_in_entourage = "99" AND mission_type = "gratitude"