The resident human population in space just doubled. A Soyuz transfer craft successfully went into orbit carrying a Belgian, Canadian, and Russian to the International Space Station, where they will join the current crew of three. It will take them about two days to rendezvous and dock to the station. Thenceforth the station will have a standing crew of six.
If the space population continues to double every nine years there will be some 6000 people in space by 2100. (And 12 million by 2200, but let's restrain ourselves to this century!)