According to a paper on the definition of democracy:
The simplest definition of democracy has been given by Karl Popper: a system that makes it possible to get rid of a government without spilling blood. This definition may be a little too restrictive, and perhaps it is laconic rather than simple. Its implications, in fact, are really rather complex.
Is there a list that shows the last time each country had a peaceful transition of government? E.g. for the US that date would be November 2016, while for Russia it would be sometime in 1991.