Head to Head BAR driver comparison for 1999 season.
[{'label': 'Mika Salo', 'data': [14, 15, 16, None, None, None, None, None, None, None, None, None, None]}, {'label': 'Ricardo Zonta', 'data': [None, None, None, 22, 22, 22, 22, 22, 22, 23, 21, 21, 22]}, {'label': 'Jacques Villeneuve', 'data': [None, None, None, None, None, None, None, None, 23, 22, 23, 23, 21]}]