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_225200_4 (reason_for_change VARCHAR, date_successor_seated VARCHAR)
### Question:
Name the total number of reason for change for not filled this congress
### Answer:
SELECT COUNT(reason_for_change) FROM table_225200_4 WHERE date_successor_seated = "Not filled this congress"