When Spencer is the county  what is total of the population (2010) (rank)? 
{'header': ['IN No.', 'County Name', 'Establishment Date (SW Indiana) (History) (Statehood)', 'County Seat', 'Time Zone', 'Population (2010) (Rank)', 'Area sq mi (km 2 ) (Rank)', 'Twps', 'ZIP code Prefix(es)', '% of Boundary by water'], 'page_title': 'Southwestern Indiana', 'section_title': 'Counties', 'caption': 'Counties', 'rows': [['14', 'Daviess', 'February 2, 1818 (10) (29) (14)', 'Washington', 'Eastern', '32,200 (6)', 'sqmi (km2) (3)', '10', '475', '55%'], ['19', 'Dubois', 'December 20, 1817 (7) (20) (4)', 'Jasper', 'Eastern', '41,889 (3)', 'sqmi (km2) (4)', '12', '475', '24%'], ['26', 'Gibson', 'April 1, 1813 (2) (8) (T)', 'Princeton', 'Central', '33,503 (5)', 'sqmi (km2) (1)', '10', '475/476', '59%'], ['42', 'Knox', 'June 6, 1790 (1) (1) (T)', 'Vincennes', 'Eastern', '38,440 (4)', 'sqmi (km2) (2)', '10', '475/478', '84%'], ['51', 'Martin', 'January 7, 1820 (11) (33) (18)', 'Shoals', 'Eastern', '10,334 (11)', 'sqmi (km2) (10)', '6', '475', '18%'], ['62', 'Perry', 'November 1, 1814 (4) (12) (T)', 'Tell City', 'Central', '19,338 (9)', 'sqmi (km2) (8)', '7', '474/475', '52%'], ['63', 'Pike', 'December 21, 1816 (6) (16) (1)', 'Petersburg', 'Eastern', '12,845 (10)', 'sqmi (km2) (9)', '9', '475/476', '35%'], ['65', 'Posey', 'November 11, 1814 (5) (13) (T)', 'Mt. Vernon', 'Central', '25,940 (7)', 'sqmi (km2) (5)', '10', '476', '63%'], ['74', 'Spencer', 'January 10, 1818 (9) (24) (9)', 'Rockport', 'Central', '20,942 (8)', 'sqmi (km2) (7)', '9', '475/476', '73%'], ['82', 'Vanderburgh', 'January 7, 1818 (8) (22) (7)', 'Evansville', 'Central', '179,703 (1)', 'sqmi (km2) (11)', '8', '476/477', '26%']]}