CREATE TABLE table_204_295 (id DECIMAL, "model" TEXT, "origin" TEXT, "type" TEXT, "version" TEXT, "in service" DECIMAL, "notes" TEXT)

which country has more vehicles listed ?
SELECT "origin" FROM table_204_295 GROUP BY "origin" ORDER BY COUNT("model") DESC LIMIT 1
SELECT "origin" FROM "table_204_295" GROUP BY "origin" ORDER BY COUNT("model") DESC NULLS LAST LIMIT 1