Where was the game where attendance was 51478?
{'header': ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Record', 'Attendance'], 'page_title': '1972 Denver Broncos season', 'page_id': '', 'types': ['real', 'text', 'text', 'text', 'text', 'text', 'real'], 'id': '1-17848578-1', 'section_title': 'Schedule', 'caption': 'Schedule', 'rows': [['1', 'September 17', 'Houston Oilers', 'W 30–17', 'Mile High Stadium', '1–0', '51656'], ['2', 'September 24', 'at San Diego Chargers', 'L 14–37', 'San Diego Stadium', '1–1', '49048'], ['3', 'October 1', 'Kansas City Chiefs', 'L 24–45', 'Mile High Stadium', '1–2', '51656'], ['4', 'October 8', 'at Cincinnati Bengals', 'L 10–21', 'Riverfront Stadium', '1–3', '55812'], ['5', 'October 15', 'Minnesota Vikings', 'L 20–23', 'Mile High Stadium', '1–4', '51656'], ['6', 'October 22', 'at Oakland Raiders', 'W 30–23', 'Oakland-Alameda County Coliseum', '2–4', '53551'], ['7', 'October 29', 'Cleveland Browns', 'L 20–27', 'Mile High Stadium', '2–5', '51656'], ['8', 'November 5', 'at New York Giants', 'L 17–29', 'Yankee Stadium', '2–6', '62689'], ['9', 'November 12', 'at Los Angeles Rams', 'W 16–10', 'Los Angeles Memorial Coliseum', '3–6', '65398'], ['10', 'November 19', 'Oakland Raiders', 'L 20–37', 'Mile High Stadium', '3–7', '51656'], ['11', 'November 26', 'at Atlanta Falcons', 'L 20–23', 'Atlanta-Fulton County Stadium', '3–8', '58850'], ['12', 'December 3', 'at Kansas City Chiefs', 'L 21–24', 'Arrowhead Stadium', '3–9', '66725'], ['13', 'December 10', 'San Diego Chargers', 'W 38–13', 'Mile High Stadium', '4–9', '51478']], 'name': 'table_17848578_1'}