What is the smallest enrollment for institutions founded in exactly 1880?
{'header': ['Institution', 'Location', 'Nickname', 'Founded', 'Type', 'Enrollment', 'Joined', 'Current Conference'], 'page_title': 'Lake Michigan Conference (defunct)', 'page_id': '', 'types': ['text', 'text', 'text', 'real', 'text', 'real', 'real', 'text'], 'id': '1-1974443-1', 'section_title': 'Members before dissolution', 'caption': 'Members before dissolution', 'rows': [['Alverno College', 'Milwaukee, Wisconsin', 'Inferno', '1887', 'Private/Catholic', '1932', '2004', 'Northern (NAC)'], ['Concordia University', 'Mequon, Wisconsin', 'Falcons', '1880', 'Private/Lutheran Missouri Synod', '1600', '1982', 'Northern (NAC)'], ['Dominican University', 'River Forest, Illinois', 'Stars', '1901', 'Private/Catholic', '3250', '2005', 'Northern (NAC)'], ['Edgewood College', 'Madison, Wisconsin', 'Eagles', '1927', 'Private/Catholic', '2000', '1974', 'Northern (NAC)'], ['Lakeland College', 'Plymouth, Wisconsin', 'Muskies', '1862', 'Private/United Church of Christ', '950', '1982', 'Northern (NAC)'], ['Maranatha Baptist Bible College', 'Watertown, Wisconsin', 'Crusaders', '1968', 'Private/Baptist', '850', '1974', 'Northern (NAC)'], ['Marian University', 'Fond du Lac, Wisconsin', 'Sabres', '1936', 'Private/Catholic', '2918', '1974', 'Northern (NAC)'], ['Milwaukee School of Engineering', 'Milwaukee, Wisconsin', 'Raiders', '1903', 'Private/Non-sectarian', '1395', '1977', 'Northern (NAC)']], 'name': 'table_1974443_1'}