CREATE TABLE table_11556 ("Year" FLOAT, "Theme" TEXT, "Mintage" FLOAT, "Issue Price" TEXT, "Finish" TEXT)

What is the earliest year a red maple had a mintage over 15,000?
SELECT MIN("Year") FROM table_11556 WHERE "Theme" = 'red maple' AND "Mintage" > '15,000'
SELECT MIN("Year") FROM "table_11556" WHERE "Mintage" > '15,000' AND "Theme" = 'red maple'