What is the lowest amount of field goals on the chart? 
{'header': ['Player', 'Position', 'Starter', 'Touchdowns', 'Extra points', 'Field goals', 'Points'], 'page_title': '1903 Michigan Wolverines football team', 'section_title': 'Michigan 88, Ferris Institute 0', 'caption': 'Michigan 88, Ferris Institute 0', 'rows': [['Tom Hammond', 'Fullback', 'yes', '3', '8', '0', '23'], ['Herb Graver', 'Right halfback', 'yes', '3', '0', '0', '15'], ['Joe Maddock', 'Right tackle', 'yes', '3', '0', '0', '15'], ['Duncan Thompson', 'Right halfback', 'no', '2', '0', '0', '10'], ['Joe Curtis', 'Left tackle', 'yes', '1', '5', '0', '10'], ['Fred Norcross', 'Left halfback', 'yes', '1', '0', '0', '5'], ['Rolla Bigelow', 'Left halfback', 'no', '1', '0', '0', '5']]}