Head to Head Shadow driver comparison for 1980 season.
[{'label': 'Stefan Johansson', 'data': [26, 27, None, None, None, None, None]}, {'label': 'Dave Kennedy', 'data': [25, 25, 27, 28, 29, 29, 29]}, {'label': 'Geoff Lees', 'data': [None, None, 21, 23, 25, 25, 25]}]