CREATE TABLE table_61918 ("Rank:" FLOAT, "Prime Minister:" TEXT, "Party:" TEXT, "Assumed Office:" TEXT, "Left Office:" TEXT, "TOTAL Time in Office:" TEXT)

What is the assumed office date of the prime minister ranked 22?
SELECT "Assumed Office:" FROM table_61918 WHERE "Rank:" = '22'
SELECT "Assumed Office:" FROM "table_61918" WHERE "Rank:" = '22'