Name the total number of game sites for chicago bears
{'header': ['Week', 'Date', 'Opponent', 'Result', 'Record', 'Game Site', 'Attendance'], 'page_title': '1965 Baltimore Colts season', 'section_title': 'Schedule', 'caption': 'Schedule', 'rows': [['1', 'September 19, 1965', 'Minnesota Vikings', 'W 35–16', '1–0', 'Memorial Stadium', '56562'], ['2', 'September 26, 1965', 'at Green Bay Packers', 'L 17–20', '1–1', 'Milwaukee County Stadium', '48130'], ['3', 'October 3, 1965', 'San Francisco 49ers', 'W 27–24', '2–1', 'Memorial Stadium', '58609'], ['4', 'October 10, 1965', 'Detroit Lions', 'W 31–7', '3–1', 'Memorial Stadium', '60238'], ['5', 'October 17, 1965', 'at Washington Redskins', 'W 38–7', '4–1', 'RFK Stadium', '50405'], ['6', 'October 24, 1965', 'Los Angeles Rams', 'W 35–20', '5–1', 'Memorial Stadium', '45827'], ['7', 'October 31, 1966', 'at San Francisco 49ers', 'W 34–28', '6–1', 'Kezar Stadium', '45827'], ['8', 'November 7, 1965', 'at Chicago Bears', 'W 26–21', '7–1', 'Wrigley Field', '45656'], ['9', 'November 14, 1965', 'at Minnesota Vikings', 'W 41–21', '8–1', 'Metropolitan Stadium', '47426'], ['10', 'November 21, 1965', 'Philadelphia Eagles', 'W 34–24', '9–1', 'Memorial Stadium', '60238'], ['11', 'November 25, 1965', 'at Detroit Lions', 'T 24–24', '9–1–1', 'Tiger Stadium', '55036'], ['12', 'December 5, 1966', 'Chicago Bears', 'L 0–13', '9–2–1', 'Memorial Stadium', '60238'], ['13', 'December 12, 1965', 'Green Bay Packers', 'L 27–42', '9–3–1', 'Memorial Stadium', '60238']]}