Well, due to the Loss of European territories during the Balkan Wars it was considerably reduced.It had a substantuial Greek minorty probably 20 percent about 2 milion people. Also had jEWS and Armenians as well as Kurds.
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About 1.8 billion. It's difficult and potentially misleading to be more precise because some regions (notably China) aren't known accurately. But it's accurate to within a few tens of millions.