Manned spaceflights statistics
Found in a french space magazine called "Espace magazine": (after completion of STS 115)
Since STS 1, the Shuttle has taken to space 2/3rds of all astronauts who went to space.
Cumulating all the astronauts time spent in space since Gagarin, we reach 81 years. Including the Soviet Union, Russia is first with 50 years...the USA total with 27 years and all other countries, a bit less than 4 years.