CREATE TABLE table_70480 ("Name" TEXT, "Years" TEXT, "Gender" TEXT, "Area" TEXT, "Authority" TEXT, "Decile" FLOAT, "Roll" FLOAT)

Name the years for porangahau school
SELECT "Years" FROM table_70480 WHERE "Area" = 'porangahau' AND "Name" = 'porangahau school'
SELECT "Years" FROM "table_70480" WHERE "Area" = 'porangahau' AND "Name" = 'porangahau school'