1060
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(lemmy.cafe)
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I find back about that it peaked at 1.4% or 1.5% in 1950 in a few sources: 2.5m to 2.7m prisoners for about 180m citizens. So significantly higher than what you found.
On Quora a Russian posted a nice graph, but I don't see a source for the data : https://www.quora.com/What-percentage-of-Soviet-citizens-were-incarcerated-at-any-given-time-The-US-has-0-7-of-its-population-in-prison-and-I-was-wondering-how-that-compares-to-the-old-USSR
Having read testimonies of the nazino island gulag and a few Russian prisoner novels, the Soviet prison system really shouldn't be compared to the USA one. Those percentages might not be far off ("only" 2x more at the worst), but numbers don't tell everything. Stalin's reign of terror was so much worse than the modern day USA dystopia. Compare the USA to modern day Canada or western Europe and it will highlight much better how bad it is doing.