CREATE TABLE table_71702 ("Name" TEXT, "Years" TEXT, "Gender" TEXT, "Area" TEXT, "Authority" TEXT, "Decile" FLOAT, "Roll" FLOAT)

Name the years when decile was less than 7 for waitoa school
SELECT "Years" FROM table_71702 WHERE "Decile" < '7' AND "Name" = 'waitoa school'
SELECT "Years" FROM "table_71702" WHERE "Decile" < '7' AND "Name" = 'waitoa school'