So, is Catalyst screwing things up in the big picture some more? Or are you using biased, in-game census numbers?
Here's the official numbers from Seattle in 2070 (this does not include SINless and is of one city; one can imagine various cities have various populations), compared to the 'current' percentage world-wide.
Humans: 66% - 39%
Elves: 13% - 15%
Dwarves: 2% - 14%
Orks: 16% - 22%
Trolls: 2% - 5%
Other: 1% - 5%
Humans take a precipitous dip, but a good fraction of that is because they basically drew off of the human totem pole to get the others to their current level. It also doesn't factor in SINs for the equation.
While I don't think elf populations should be growing, that too could be a part of local versus world-wide.
Dwarfs having such a steep increase in population this edition does seem a little... Off. That said, as one of the main metatypes, I definitely wouldn't have left them at 2%. That's far too low. Perhaps my idea of dwarfs just avoiding Seattle works.
It is explicitly stated that ork populations are booming, with an expected 30% of the world population being ork around 2080. That is an insane increase compared to usual humans, but ork physiology does help that along. Also, less documentation due to less likelihood to have a SIN. Having 5 years to go up 6% could be reasonable. And it still doesn't factor in the bias of in-game polls of the Seattle numbers versus the world-wide population numbers.
Trolls should be somewhat rare, but 1% seems extremely low as well. Given trolls don't fit into cities that well and have the same kinds of issues with SINs as orks do, I'd tend up a little here as well when compared to the Seattle numbers, though not as high as dwarfs.
Others getting such a population increase is extremely off, in my mind. Adding up all of the numbers from the individual metasapients and all, the Other population comes out to an estimated 481,500, with no numbers for SURGE or Pixies given. Rounding it up to 500,000 to fill in the gap would mean they would have to be 500,000 out of 10,000,000 to be 5% of the population (unless the pixie horde is much larger than anticipated, and they're awaiting the chance to strike). We can brush these guys into the cracks as far as I'm concerned.
Were I to assign percentages of my own to the setting (a bit of fluff to go along with the binder full of other house-rules to make the game feasible at any of the tables I play at), I'd change the numbers to this (and I'd definitely vary these from region to region);
Humans- 50%
Orks- 25%
Elves- 10%
Dwarfs- 10%
Trolls- 5%
Others- ~0%
Humans are still the most populous, but if everyone decided to play 'kick the humies,' they'd be about even.
Orks are catching up, given their propensity towards multiple births and multiple children per birth. A relatively short lifespan doesn't reign them in that well.
Elves probably don't reproduce all that fast, but given nobody is dying of old age-related causes any time soon...
Dwarfs should be a bit like elves what with the old age thing.
This puts trolls at a percentage of the population where they can't just be written off.
Others, by the numbers, don't come up to a full percent of the world's population. They shouldn't impact the percentages by hogging the precious numbers.
In places like Japan, spike the human population at the cost of others. Elven nations are dominated by (you guessed it) elves. Amazonia, Angkor Wat and the Yakut would have appreciable numbers of Others. Those metahuman enclaves in the AGS would have skewed numbers as well.