CREATE TABLE table_204_160 (id DECIMAL, "rank" DECIMAL, "name" TEXT, "nationality" TEXT, "time" TEXT, "notes" TEXT)

from what country did the last place compete for ?
SELECT "nationality" FROM table_204_160 ORDER BY "rank" DESC LIMIT 1
SELECT "nationality" FROM "table_204_160" ORDER BY "rank" DESC NULLS LAST LIMIT 1