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_222666_1 (period_of_validity VARCHAR, former_country_name VARCHAR)
### Question:
Name the total number for period of validity for upper volta
### Answer:
SELECT COUNT(period_of_validity) FROM table_222666_1 WHERE former_country_name = "Upper Volta"