How many parties received 29.9% of the vote in Manhattan?
{'header': ['1921', 'party', 'Manhattan', 'The Bronx', 'Brooklyn', 'Queens', 'Richmond [Staten Is.]', 'Total', '%'], 'page_title': '', 'section_title': '', 'caption': '', 'rows': [['John Francis Hylan', 'Democratic', '261,452', '118,235', '260,143', '87,676', '22,741', '750247', '64.2%'], ['John Francis Hylan', 'Democratic', '62.9%', '67.6%', '62.1%', '69.0%', '70.8%', '750247', '64.2%'], ['Henry H. Curran', 'Republican - Coalition', '124,253', '34,919', '128,259', '36,415', '9,000', '332846', '28.5%'], ['Henry H. Curran', 'Republican - Coalition', '29.9%', '20.0%', '30.6%', '28.6%', '28.0%', '332846', '28.5%'], ['Jacob Panken', 'Socialist', '28,756', '21,255', '29,580', '2,741', '275', '82607', '7.1%'], ['Jacob Panken', 'Socialist', '6.9%', '12.2%', '7.1%', '2.2%', '0.9%', '82607', '7.1%'], ['Jerome T. De Hunt', 'Farmer Labor', '321', '133', '395', '88', '71', '1008', '0.1%'], ['John P. Quinn', 'Socialist Labor', '316', '244', '346', '123', '20', '1049', '0.1%']]}