The above posters are correct about the values of the FFXIAH being additively skewed. That being said, I'm only trying to answer the question about how many left. The answer is about 10,000. Per capita (percentage) measurements would be inaccurate because of the data skewing; however, the skewed amounts have remained unchanged during the whole period of observation, as far as I can tell. Thus, ignoring the skewed amounts and taking the difference yields us with 10,000--which would be the same value we'd have obtained even if the amounts were not skewed. What would change if the amounts were not skewed are per capita measurements and current population measurements--neither of which I claim to know or can give you unfortunately.
If the numbers for the dead servers are changing, then that 10,000 would indeed be inaccurate.