[graemep]

A big chunk of it was the improvement in China, which started with a recovery from a previous disastrous decline.

The last 100+ years have also been atypical. Two world wars which disrupted economies in ways that lead to redistribution, huge changes from the end of European empires, the fall of the Soviet Union and communism, and technological advances that automated work but created may new jobs.

I would be very reluctant to assume a continuing trend from that.