What is the smallest number of enrolled students?
{'header': ['Institution', 'Location', 'Nickname', 'Enrollment', 'Established'], 'page_title': 'Delaware Valley Collegiate Hockey Conference', 'section_title': "Current Women's teams", 'caption': "Current Women's teams", 'rows': [['Villanova University', 'Villanova, PA', 'Wildcats', '6335', '2006'], ['Towson University', 'Towson, MD', 'Tigers', '21950', '2013'], ['Rutgers University', 'New Brunswick, NJ', 'Knights', '42327', '2011'], ['Slippery Rock University', 'Slippery Rock, PA', 'Pride', '8500', '2002'], ['University of Virginia', 'Charlottesville, VA', 'Cavaliers', '12748', '2000'], ['Liberty University', 'Lynchburg, VA', 'Flames', '12400', '2011'], ['University of Maryland', 'College Park, MD', 'Terrapins', '22412', '1997']]}