[pradocchia]

Increasing year of birth means increasing human knowledge.

What, since the 1990s? No, don't be silly. There may have been a bump due to improved access to basic human knowledge. Is this what you mean?

[danbruc]

Good point, raw increase in human knowledge is probably not a good explanation. But it is almost a quarter of a century since 1990, the rate at which new knowledge is obtained is constantly increasing, the Internet made access to this knowledge easier than ever before, people have - I guess - more time available to spend on such topics, the Internet enabled discussions in a way not possible before, ... Therefore a better explanation is probably easier access to knowledge than raw increase in knowledge.

[azakai]

And the improved access is likely mostly due to the internet.