How many million u.s. Viewers watched season 1?
{'header': ['Season', 'Timeslot', 'Season premiere', 'Season finale', 'TV season', 'Rank', 'U.S. viewers (in millions)', 'Rating (adults 18–49)'], 'page_title': 'Gossip Girl', 'section_title': 'U.S. television ratings', 'caption': 'U.S. television ratings', 'rows': [['1', 'Wednesday 9/8c Monday 8/7c', 'September 19, 2007', 'May 19, 2008', '2007–08', '#196', '2.35', '1.2'], ['2', 'Monday 8/7c', 'September 1, 2008', 'May 18, 2009', '2008–09', '#168', '2.48', '1.4'], ['3', 'Monday 9/8c', 'September 14, 2009', 'May 17, 2010', '2009–10', '#135', '2.02', '1.1'], ['4', 'Monday 9/8c', 'September 13, 2010', 'May 16, 2011', '2010–11', '#139', '1.64', '0.8'], ['5', 'Monday 8/7c', 'September 26, 2011', 'May 14, 2012', '2011–12', '#188', '1.18', '0.6']]}