How many winners were there in the race of 1922
{'header': ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates'], 'page_title': 'United States House of Representatives elections, 1930', 'section_title': '', 'caption': '', 'rows': [['Mississippi 1', 'John E. Rankin', 'Democratic', '1920', 'Re-elected', 'John E. Rankin (D) Unopposed'], ['Mississippi 2', 'Wall Doxey', 'Democratic', '1928', 'Re-elected', 'Wall Doxey (D) Unopposed'], ['Mississippi 3', 'William Madison Whittington', 'Democratic', '1924', 'Re-elected', 'William Madison Whittington (D) Unopposed'], ['Mississippi 4', 'Jeff Busby', 'Democratic', '1922', 'Re-elected', 'Jeff Busby (D) Unopposed'], ['Mississippi 5', 'Ross A. Collins', 'Democratic', '1920', 'Re-elected', 'Ross A. Collins (D) Unopposed'], ['Mississippi 6', 'Robert S. Hall', 'Democratic', '1928', 'Re-elected', 'Robert S. Hall (D) Unopposed'], ['Mississippi 7', 'Percy E. Quin', 'Democratic', '1912', 'Re-elected', 'Percy E. Quin (D) Unopposed']]}