How many original air dates have U.S. Views (millions) of 19.49?
{'header': ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (millions)'], 'page_title': '', 'section_title': '', 'caption': '', 'rows': [['184', '2', '"The Happy Place"', 'Nathan Hope', 'Sarah Goldfinger', 'October16,2008', '19.28'], ['185', '3', '"Art Imitates Life"', 'Kenneth Fink', 'Evan Dunsky', 'October23,2008', '19.49'], ['186', '4', '"Let It Bleed"', 'Brad Tanenbaum', 'Corinne Marinan', 'October30,2008', '19.10'], ['187', '5', '"Leave out All the Rest"', 'Kenneth Fink', 'Jacqueline Hoyt', 'November6,2008', '18.18'], ['188', '6', '"Say Uncle"', 'Richard J. Lewis', 'Dustin Lee Abraham', 'November13,2008', '19.05'], ['190', '8', '"Young Man with a Horn"', 'Jeffrey G. Hunt', 'David Rambo', 'December4,2008', '17.48'], ['191', '9', '"19 Down..." (Part 1)', 'Kenneth Fink', 'Carol Mendelsohn & Naren Shankar', 'December11,2008', '20.86'], ['192', '10', '"One to Go" (Part 2)', 'Alec Smight', 'Carol Mendelsohn & Naren Shankar', 'January15,2009', '24.25'], ['193', '11', '"The Grave Shift"', 'Richard J. Lewis', 'Bradley Thompson & David Weddle', 'January22,2009', '17.57'], ['194', '12', '"Disarmed and Dangerous"', 'Kenneth Fink', 'Dustin Lee Abraham & Evan Dunsky', 'January29,2009', '20.15'], ['195', '13', '" Deep Fried and Minty Fresh "', 'Alec Smight', 'Corinne Marrinan & Sarah Goldfinger', 'February12,2009', '17.94'], ['196', '14', '"Miscarriage of Justice"', 'Louis Milito', 'Richard Catalani & Jacqueline Hoyt', 'February19,2009', '16.92'], ['198', '16', '"Turn, Turn, Turn"', 'Richard J. Lewis', 'Tom Mularz', 'March5,2009', '20.88'], ['199', '17', '"No Way Out"', 'Alec Smight', 'Fulvia Charles-Lindsay', 'March12,2009', '17.13'], ['201', '19', '"The Descent of Man"', 'Chris Leitch', 'Evan Dunsky', 'April9,2009', '16.63'], ['204', '22', '"The Gone Dead Train"', 'Alec Smight', 'Jacqueline Hoyt', 'April30,2009', '15.54']]}