So you don't actually know.
Finally, Hamilton admitted that although he went to the last races of 2015 determined to win, his motivation after wrapping up the title in October could explain his flagging recent form. "You still have to commit and work super-hard but, for sure you're kind of like 'My job's done, I wish the season was over, wish I could go on holiday'," he said of the final trio of races in Mexico, Brazil and Abu Dhabi, which were all won from pole by Rosberg.