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_2160008_4 (reason_for_change VARCHAR, date_successor_seated VARCHAR)
### Question:
Name the number of reason for change on may 11, 1939
### Answer:
SELECT COUNT(reason_for_change) FROM table_2160008_4 WHERE date_successor_seated = "May 11, 1939"