CREATE TABLE table_204_133 (id DECIMAL, "school year" TEXT, "class a" TEXT, "class aa" TEXT, "class aaa" TEXT, "class aaaa" TEXT, "class aaaaa" TEXT)

what was the only year keene won class aa ?
SELECT "school year" FROM table_204_133 WHERE "class aa" = 'keene'
SELECT "school year" FROM "table_204_133" WHERE "class aa" = 'keene'