Dates?
I suppose not; the narrative in Appendix B is not precisely delimited in terms of the exact period to which that description specifically applies.
Still, it is a description of how things generally were in the aftermath of the War of the Rings.
The context and the point of making the statement is to describe the situation in the early part of the Fourth Age.
It would be ridiculous to assume that it became that way instantly. So, at least a few decades went by before most Lórien Elves had either removed to East Lórien (as many may have wanted to do out of sadness for the passing of the Lady and for new challenges and surroundings) or went over the Sea, as many, if not almost all, Lórien Elves were Eldar of Beleriandic or Nandorin origin.
But what would be the point of making such a statement if it described matters for only a few year's time? So, it must have been an accurate description for how things prevailed until the end of what is said about the days of old, or at least the 120-some years into the Fourth Age before Arwen died, which was certainly reported somehow to Barahir Prince of Ithilien and no doubt her children, and that description of relative elvish populations should certainly have been the case for at least a few hundred years, until presumably the last Eldarin ships left Middle-Earth.
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The hoes unrecked in the fields were flung, __ and fallen ladders in the long grass lay __ of the lush orchards; every tree there turned __ its tangled head and eyed them secretly, __ and the ears listened of the nodding grasses; __ though noontide glowed on land and leaf, __ their limbs were chilled.
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