CREATE TABLE table_73368 ("Former country name" TEXT, "Former codes" TEXT, "Period of validity" TEXT, "ISO 3166-3 code" TEXT, "New country names and codes" TEXT)

Name the total number for period of validity for upper volta
SELECT COUNT("Period of validity") FROM table_73368 WHERE "Former country name" = 'Upper Volta'
SELECT COUNT("Period of validity") FROM "table_73368" WHERE "Former country name" = 'Upper Volta'