It would be interesting to see this chart start much further back, such as when most humans were hunter-gatherers. Yes, working hours per week have declined since the beginning of agriculture, but there is evidence that humans worked much more as farmers than as hunter-gatherers. For example: <a href="https://www.cam.ac.uk/research/news/farmers-have-less-leisure-time-than-hunter-gatherers-study-suggests" rel="nofollow noreferrer">https://www.cam.ac.uk/research/news/farmers-have-less-leisur...</a>.