CREATE TABLE table_73394 ("State  ( class ) " TEXT, "Vacator" TEXT, "Reason for change" TEXT, "Successor" TEXT, "Date of successors formal installation" TEXT)

What is the number of vacators when the successor was William H. Wells ( F )?
SELECT COUNT("Vacator") FROM table_73394 WHERE "Successor" = 'William H. Wells ( F )'
SELECT COUNT("Vacator") FROM "table_73394" WHERE "Successor" = 'William H. Wells ( F )'