CREATE TABLE table_name_27 (year_of_most_recent_appearance INT, year_of_first_appearance VARCHAR, corps_name VARCHAR)

What is the average year of the most recent appearance of the Boston Crusaders, who had their first appearance after 1976?
SELECT AVG(year_of_most_recent_appearance) FROM table_name_27 WHERE year_of_first_appearance > 1976 AND corps_name = "boston crusaders"
SELECT AVG("year_of_most_recent_appearance") FROM "table_name_27" WHERE "boston crusaders" = "corps_name" AND "year_of_first_appearance" > 1976