Total production per worker-hour has been increasing since the 1800s I'd imagine. But it doesn't matter that much if it is increasing, what matters is whether i

Total production per worker-hour has been increasing since the 1800s I'd imagine. But it doesn't matter that much if it is increasing, what matters is whether it is increasing faster than the labor force shrinks. But a huge proportion of productivity increases are due to increased access to energy. So there are two headwinds: increasing energy scarcity and declining workforce size. To some extent the productivity numbers for developed countries need to be discounted too because a lot of low value add work (mining, basic manufacturing, etc.) that is labor intensive takes place in poor countries where labor is cheap.