CREATE TABLE table_67551 ("Season" FLOAT, "Series" TEXT, "Races" TEXT, "Wins" TEXT, "Position" TEXT)

How many wins have a Series of formula nippon, and a Position of 8th?
SELECT "Wins" FROM table_67551 WHERE "Series" = 'formula nippon' AND "Position" = '8th'
SELECT "Wins" FROM "table_67551" WHERE "Position" = '8th' AND "Series" = 'formula nippon'