CREATE TABLE table_16664 ("Round" FLOAT, "Grand Prix" TEXT, "Date" TEXT, "Location" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Winning Driver" TEXT, "Winning Constructor" TEXT, "Report" TEXT)

whatthe minimum round where grand prix is german grand prix
SELECT MIN("Round") FROM table_16664 WHERE "Grand Prix" = 'German Grand Prix'
SELECT MIN("Round") FROM "table_16664" WHERE "Grand Prix" = 'German Grand Prix'