How many locations were there when sydney was the home team?
{'header': ['Home team', 'Home team score', 'Away team', 'Away team score', 'Ground', 'Crowd', 'Date'], 'page_title': '2002 Wizard Home Loans Cup', 'page_id': '', 'types': ['text', 'text', 'text', 'text', 'text', 'real', 'text'], 'id': '1-16388478-2', 'section_title': 'Round 1', 'caption': 'Round 1', 'rows': [['St Kilda', '16.13 (109)', 'Melbourne', '5.11 (41)', 'Colonial Stadium', '13814', 'Friday, 15 February'], ['Fremantle', '13.9 (87)', 'Western Bulldogs', '10.8 (68)', 'Subiaco Oval', '13304', 'Friday, 15 February'], ['Geelong', '12.7 (79)', 'Richmond', '7.13 (55)', 'Baytec Stadium', '11531', 'Saturday, 16 February'], ['Carlton', '12.9 (81)', 'West Coast', '17.14 (116)', 'Optus Oval', '5217', 'Saturday, 16 February'], ['Brisbane Lions', '14.7 (91)', 'Adelaide', '14.9 (93)', 'Gabba', '17236', 'Saturday, 16 February'], ['Hawthorn', '13.10 (88)', 'Kangaroos', '11.10 (76)', 'York Park', '12861', 'Sunday, 17 February'], ['Sydney', '18.11 (119)', 'Collingwood', '5.9 (39)', 'Manuka Oval', '7826', 'Sunday, 17 February']], 'name': 'table_16388478_2'}