In 1700 the UK was still mainly agrarian with low production. France, under Louis XIV, was booming, the dominant European power. Germany was a collection of bustling, small states and Russia was entering a sustained period of expansion which ex[lains why it's population was less than that of Germany. China was entering a period of modest growth having passed 100 million in 1650. Note that many extimates of earlier Chinese population are low as they did not include serfs or slaves.

"'Every moment dies a man / And one and a sixteenth is born.' I may add that the exact figures are 1.167, but something must, of course, be conceded to the laws of metre." Charles Babbage in a letter to Tennyson