the full capacity of the AM General plant is said to be 40,000 units per year, all of which were made/sold in the '03 model year.
from wikipedia 29,000 in '04 and 23,000 in '05
from somewhere else, i read that (from a note posted early this year) 100,000 H2s had sold.
One Jerry York (board member at GM, i think) called for the end of the hummer brand, but was outvoted.
some of
these links have monthly sales figures
anyway, i have been curious about that as well - how popular is the H2? you see dozens of stories about how hummer sales are tanking and nobody wants them and so on. But it isn't true, even with the release of the H3, sales of the H2 are on pace to be ~20k for this year, and their initial goal for the H2 was 25,000.
as far as i can judge, it'll be 110-120,000 H2s sold by the end of this year.
The H3 sells at a much higher rate, more like 50,000/year, maybe more, i haven't dug around on that so much.