Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_61918 ( "Rank:" real, "Prime Minister:" text, "Party:" text, "Assumed Office:" text, "Left Office:" text, "TOTAL Time in Office:" text )

### Question ###
What is the assumed office date of the prime minister ranked 22?

### Accurate SQL ###

SELECT "Assumed Office:" FROM table_61918 WHERE "Rank:" = '22'