CREATE TABLE table_204_190 (id DECIMAL, "rank" DECIMAL, "city" TEXT, "county" TEXT, "state" TEXT, "percentage" TEXT)

number of cities in new jersey where the korean population is greater than 15 %
SELECT COUNT("city") FROM table_204_190 WHERE "state" = 'new jersey' AND "percentage" > 15
SELECT COUNT("city") FROM "table_204_190" WHERE "percentage" > 15 AND "state" = 'new jersey'