Head to Head Williams driver comparison for 2009 season.
[{'label': 'Nico Rosberg', 'data': [6, 7, 11, 11, 10, 11, 7, 7, 7, 5, 5, 6, 6, 7, 7, 7, 7]}, {'label': 'Kazuki Nakajima', 'data': [None, 15, 18, 19, 20, 20, 20, 20, 20, 18, 19, 19, 19, 19, 19, 19, 20]}]