CREATE TABLE table_139 ("1921" TEXT, "party" TEXT, "Manhattan" TEXT, "The Bronx" TEXT, "Brooklyn" TEXT, "Queens" TEXT, "Richmond [Staten Is.]" TEXT, "Total" FLOAT, "%" TEXT)

How many parties received 29.9% of the vote in Manhattan?
SELECT COUNT("party") FROM table_139 WHERE "Manhattan" = '29.9%'
SELECT COUNT("party") FROM "table_139" WHERE "Manhattan" = '29.9%'